feat: hot reload eszip bundle when function source changes

[avallete]

What kind of change does this PR introduce?

• Feat: add hot reloading to functions serve command
• Functions url's in the serve command

Screen.Recording.2025-06-07.at.17.31.04.mov

[coveralls]

Pull Request Test Coverage Report for Build 15510096608

Details

• 382 of 528 (72.35%) changed or added relevant lines in 4 files are covered.
• 7 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.6%) to 55.643%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/functions/serve/serve.go	30	56	53.57%
internal/functions/serve/watcher.go	111	144	77.08%
internal/functions/serve/service.go	134	169	79.29%
internal/functions/serve/test_helpers.go	107	159	67.3%

Files with Coverage Reduction	New Missed Lines	%
internal/functions/serve/serve.go	2	50.0%
internal/gen/keys/keys.go	5	12.9%

Totals
Change from base Build 15492678573:	0.6%
Covered Lines:	6247
Relevant Lines:	11227

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💛 - Coveralls