Add multi-root workspace configuration file

[st0012]

Currently, to make LSP servers like Ruby LSP properly work for gem, like sentry-ruby, we need to open /sentry-ruby separately. When working on tasks across multiple gems, like sentry-ruby and sentry-rails, it requires 2 separate VS Code windows while each can not interact with each other.

For example, when using Debug code lens provided by Ruby LSP in sentry-rails's tests, we can put breakpoints inside sentry-rails's codebase, but not in sentry-ruby.

But if we open the project through this new workspace configuration file, the multi-root workspace feature in VS Code will allow us to

• Access code across multiple gems
• Debug code with VS Code across multiple gems
• Run language servers independently for each gem

Limitations

• CHANGELOG.md can't be included under this setting because VS Code decided to only support folders (Allow a workspace to show individual files from other folders microsoft/vscode#45177)

Potential Improvements

• We can add workspace-level copilot prompt to make Copilot smarter about the SDK (example)
• We can add some launch configurations to make debugging with our example apps easier
• If you are used to VS Code tasks, we can add some project-wide tasks (linting, testing...etc.) that may be handy

#skip-changelog

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.20%. Comparing base (ad535cc) to head (26e7857).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2505   +/-   ##
=======================================
  Coverage   98.20%   98.20%           
=======================================
  Files         128      128           
  Lines        4837     4837           
=======================================
  Hits         4750     4750           
  Misses         87       87           

Components	Coverage Δ
sentry-ruby	98.57% <ø> (ø)
sentry-rails	97.07% <ø> (ø)
sentry-sidekiq	97.42% <ø> (ø)
sentry-resque	92.85% <ø> (ø)
sentry-delayed_job	95.65% <ø> (ø)
sentry-opentelemetry	99.31% <ø> (ø)

[solnic]

I already have a setup like that, so I'm happy to see this being added to the repo where we can manage it together :)