manifest: Give the option to get BabbleSim via the manifest

[aescolar]

To improve users experience, give the option to users to fetch the required BabbleSim components using the west manifest.
Until now, users would need to either use the Zephyr docker image, or fetch bsim on their own.
For many years there has been a request to automate this process. This is the first step.

Fixes #55698

Note: A set of follow ups could/would:

• For developers ease, have cmake find the simulator thru west if the environment variables that tell where
  the simulator is are not set. aescolar@9e331be
• Add a cmake check to check the simulator is the necessary version, and otherwise instruct users to west update and rebuild it: aescolar@d9a49dc
• Have CI use the version of the simulator in the manifest

[zephyrbot]

The following west manifest projects have been modified in this Pull Request:

Name	Old Revision	New Revision	Diff
bsim	N/A	zephyrproject-rtos/babblesim-manifest@908ffde (main)	N/A

Note: This message is automatically posted and updated by the Manifest GitHub Action.

[jori-nordic]

Built and ran the gatt settings test successfully with the bsim fetched using this PR.

[stephanosio]

@aescolar Regarding the following documentation build failure, you can cherry-pick 6c0b695 to fix the issue.

make: Entering directory '/home/runner/work/zephyr/zephyr/doc'
make html DT_TURBO_MODE=1
make[1]: Entering directory '/home/runner/work/zephyr/zephyr/doc'
cmake \
	-GNinja \
	-B_build \
	-S. \
	-DDOC_TAG=development \
	-DSPHINXOPTS="-q -W -t publish" \
	-DLATEXMKOPTS="-halt-on-error -no-shell-escape" \
	-DDT_TURBO_MODE=1
Loading Zephyr module(s) (Zephyr repository): doc
-- Found Python3: /usr/bin/python3.10 (found suitable exact version "3.10.6") found components: Interpreter 
-- Cache files will be written to: /home/runner/.cache/zephyr
-- Found west (found suitable version "1.0.0", minimum required is "1.0.0")
CMake Error at /home/runner/work/zephyr/zephyr/cmake/modules/zephyr_module.cmake:77 (message):
  Traceback (most recent call last):

    File "/home/runner/work/zephyr/zephyr/scripts/zephyr_module.py", line 718, in <module>
      main()
    File "/home/runner/work/zephyr/zephyr/scripts/zephyr_module.py", line 663, in main
      west_projs = west_projects()
    File "/home/runner/work/zephyr/zephyr/scripts/zephyr_module.py", line 531, in west_projects
      manifest = Manifest.from_file()
    File "/home/runner/.local/lib/python3.10/site-packages/west/manifest.py", line 1170, in from_file
      return Manifest(topdir=topdir, config=config,
    File "/home/runner/.local/lib/python3.10/site-packages/west/manifest.py", line 1396, in __init__
      self._load_validated()
    File "/home/runner/.local/lib/python3.10/site-packages/west/manifest.py", line 1791, in _load_validated
      self._load_projects(manifest_data, url_bases, defaults)
    File "/home/runner/.local/lib/python3.10/site-packages/west/manifest.py", line [21](https://github.com/zephyrproject-rtos/zephyr/actions/runs/4502917193/jobs/7925415081?pr=55696#step:7:22)14, in _load_projects
      self._import_from_project(project, imp)
    File "/home/runner/.local/lib/python3.10/site-packages/west/manifest.py", line 2300, in _import_from_project
      self._import_map_from_project(project, imp)
    File "/home/runner/.local/lib/python3.10/site-packages/west/manifest.py", line 2327, in _import_map_from_project
      imported = self._import_content_from_project(project, imap.file)
    File "/home/runner/.local/lib/python3.10/site-packages/west/manifest.py", line 2395, in _import_content_from_project
      content = self._ctx.project_importer(project, path)
    File "/home/runner/.local/lib/python3.10/site-packages/west/manifest.py", line 164, in _default_importer
      raise ManifestImportFailed(project, file)

  west.manifest.ManifestImportFailed: ManifestImportFailed: project <Project
  bsim ('/home/runner/work/zephyr/tools/bsim') at
  bc[22](https://github.com/zephyrproject-rtos/zephyr/actions/runs/4502917193/jobs/7925415081?pr=55696#step:7:23)891208d453a8cb851e4ecdc8f165f3a33890> value west.yml

Call Stack (most recent call first):
  /home/runner/work/zephyr/zephyr/cmake/modules/doc.cmake:24 (include)
  /home/runner/work/zephyr/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:75 (include)
  /home/runner/work/zephyr/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:117 (include_boilerplate)
  CMakeLists.txt:7 (find_package)


-- Configuring incomplete, errors occurred!
See also "/home/runner/work/zephyr/zephyr/doc/_build/CMakeFiles/CMakeOutput.log".
make[1]: *** [Makefile:[23](https://github.com/zephyrproject-rtos/zephyr/actions/runs/4502917193/jobs/7925415081?pr=55696#step:7:24): configure] Error 1
make[1]: Leaving directory '/home/runner/work/zephyr/zephyr/doc'
make: Leaving directory '/home/runner/work/zephyr/zephyr/doc'
make: *** [Makefile:17: html-fast] Error 2

[aescolar]

Added DNM following @nashif request for further discussion

[tejlmand]

Good direction.

Let's take this one step further 😃

Cmake changes will be postponed to another PR

[marc-hb]

This breaks west update only what I need for all users:

• bsim module must be cloned for west to work #57198