Add a build rule which produces compile_commands.json for clangd

[SandSnip3r]

Description

When using VSCode-based editors (but not VSCode), clangd is the language server of choice. This PR adds a new build rule which generates a compile_commands.json file which can be used by clangd. This enables code navigation in the IDE easily.

Fixes # (issue)

Type of change

• New feature (non-breaking change which adds functionality)

Checklist:

• My code follows the style guidelines of this project (You can use the linters)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas and hacks
• I have made corresponding changes to the documentation
• I have added tests to verify my fix or my feature
• New and existing unit tests pass locally with my changes
• I have added the relevant labels to my PR in so that relevant reviewers are notified

[narendasan]

Looks cool, will let @lanluo-nvidia or @apbose do the final approve and merge

[apbose]

The CI is failing. I believe adding the same dependancy to toolchains/ci_workspaces/MODULE.bazel.tmpl should resolve this, or you could have a separate subpackage for clangd.