feat: Add staticChangeCount and VM service extension to DeveloperTools

[nielsenko]

Description

Add staticChangeCount getter and ext.relic.notifyStaticChange VM service extension to DeveloperTools. External tools (e.g. the serverpod start --watch comand) can call the extension to notify the app of static file changes.

Related Issues

• Related: Allow running the server with hot reload/restart support serverpod#4773

Pre-Launch Checklist

• This update focuses on a single feature or bug fix.
• I have read and followed the Dart Style Guide and formatted the code using dart format.
• I have referenced at least one issue this PR fixes or is related to.
• I have updated/added relevant documentation (doc comments with ///), ensuring consistency with existing project documentation.
• I have added new tests to verify the changes.
• All existing and new tests pass successfully.
• I have documented any breaking changes below.

Breaking Changes

• Includes breaking changes.
• No breaking changes.

Additional Notes

None.

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[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.20%. Comparing base (0cd47b8) to head (abc6167).

Files with missing lines	Patch %	Lines
packages/relic_core/lib/src/router/relic_app.dart	66.66%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #341      +/-   ##
==========================================
- Coverage   91.28%   91.20%   -0.08%     
==========================================
  Files          97       97              
  Lines        3832     3844      +12     
  Branches     1953     1960       +7     
==========================================
+ Hits         3498     3506       +8     
- Misses        334      338       +4     

Flag	Coverage Δ
relic_core	90.92% <66.66%> (-0.09%)	⬇️
relic_io	93.33% <ø> (ø)

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[nielsenko]

Again tests that depends on VmService (like hot-reload tests) are not counted in coverage currently. Please disregard the low coverage.

[marcelomendoncasoares]

LGTM!