feat(2688): --watch for changes

[beelchester]

fixes: #2688
/claim #2688

Example

tailcall_watch.mp4

[codecov]

Codecov Report

Attention: Patch coverage is 0.66225% with 150 lines in your changes missing coverage. Please review.

Project coverage is 86.66%. Comparing base (36aba8f) to head (efc9515).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
src/cli/tc/start.rs	0.00%	139 Missing ⚠️
src/cli/server/http_server.rs	0.00%	8 Missing ⚠️
src/cli/tc/run.rs	0.00%	2 Missing ⚠️
src/cli/command.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2707      +/-   ##
==========================================
- Coverage   87.14%   86.66%   -0.48%     
==========================================
  Files         254      254              
  Lines       25144    25281     +137     
==========================================
- Hits        21911    21910       -1     
- Misses       3233     3371     +138     

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[github-actions]

Action required: PR inactive for 5 days.
Status update or closure in 10 days.

[tusharmath]

On restarts the server should only log the following:

[INFO] Reloaded configuration ./examples/jsonplacholder.graphql

@beelchester

Validation errors don't show up in the restarts

Write an invalid configuration and start the server, it doesn't show any error.

[github-actions]

Action required: PR inactive for 5 days.
Status update or closure in 10 days.

[github-actions]

Action required: PR inactive for 5 days.
Status update or closure in 10 days.