Dual license: AGPL + Element Commercial

[manuroe]

Make it clear that the code is dual licensed.
Note there is a new LICENSE-COMMERCIAL file.

[github-actions]

	Warnings
⚠️	This pull request seems relatively large. Please consider splitting it into multiple smaller ones.
⚠️	Some of the commits are missing ticket numbers. Please consider squashing all commits that don't have a tracking number.
⚠️	You seem to have made changes to views. Please consider adding screenshots.

Generated by 🚫 Danger Swift against 029821c

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
840	1	839	0

View the full list of 1 ❄️ flaky tests

PreviewTests test_loginScreen()

Flake rate in main: 26.78% (Passed 134 times, Failed 49 times)

Stack Traces | 4.03s run time

failed - Snapshot "matrix.org" does not match reference.

@−
"file:.../__Snapshots__/PreviewTests/test_loginScreen-iPhone-16-en-GB.matrix-org.png"
@+
"file:.../tmp/PreviewTests/test_loginScreen-iPhone-16-en-GB.matrix-org.png"

To configure output for a custom diff tool, use 'withSnapshotTesting'. For example:

    withSnapshotTesting(diffTool: .ksdiff) {
      // ...
    }

The percentage of pixels that match 0.8511963 is less than required 1.0
The lowest perceptual color precision 0.39937502 is less than required 0.98 (.../PreviewTests/Sources/PreviewTests.swift:84)

To view individual test run time comparison to the main branch, go to the Test Analytics Dashboard

[manuroe]

This PR is draft until we get a confirmation from legals.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[manuroe]

This is all good. The PR can be reviewed.

[Velin92]

@manuroe LGTM however I think we should also update the README to include a link and a reference to the commercial license