Script for creating compilation database

[justsmth]

Description of changes:

• A compilation database is a JSON file that helps facilitate code assistance within a code/text editor. This is typically via the editor's integration with Clangd/LSP. It is supported by a variety of editors: VSCode, CLion, Neovim, Helix among others.
• This script simplifies the creation of this database for AWS-LC: compile_commands.json
• This adds the compile_commands.json file to .gitignore.

Testing

• I tested the script on both Linux and macOS.

❯ ./util/build_compilation_database.sh
...
❯ ls -lh *.json
-rw-rw-r-- 1 justsmth justsmth 456K Jun  3 14:04 compile_commands.json

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.05%. Comparing base (8258d73) to head (149dd6f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1617   +/-   ##
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  Coverage   78.05%   78.05%           
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  Files         562      562           
  Lines       94600    94600           
  Branches    13575    13574    -1     
=======================================
+ Hits        73840    73844    +4     
+ Misses      20168    20161    -7     
- Partials      592      595    +3     

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