Update language service when manifest is saved. (Closes #1284)

[orpuente-MS]

This PR enables sending document-updates to a given project documents when its manifest is edited and saved.

manifest-watcher-demo.mp4

[github-actions]

Benchmark for 9a8cc47

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Test	Base	PR	%
Array append evaluation	352.1±4.37µs	350.3±1.29µs	-0.51%
Array literal evaluation	193.6±8.77µs	192.9±2.41µs	-0.36%
Array update evaluation	431.2±1.94µs	431.1±1.95µs	-0.02%
Core + Standard library compilation	16.8±0.04ms	16.8±0.06ms	0.00%
Deutsch-Jozsa evaluation	5.1±0.08ms	5.1±0.06ms	0.00%
Large file parity evaluation	33.7±0.09ms	33.7±0.22ms	0.00%
Large input file compilation	11.9±0.07ms	11.1±0.12ms	-6.72%
Large input file compilation (interpreter)	43.1±0.97ms	43.0±0.89ms	-0.23%
Large nested iteration	34.2±0.26ms	34.1±0.16ms	-0.29%
Perform Runtime Capabilities Analysis (RCA) on Deutsch-Jozsa sample	1477.5±30.05µs	1479.9±26.74µs	+0.16%
Perform Runtime Capabilities Analysis (RCA) on large file sample	7.6±0.08ms	7.6±0.14ms	0.00%
Perform Runtime Capabilities Analysis (RCA) on teleport sample	1389.3±32.34µs	1395.2±45.69µs	+0.42%
Perform Runtime Capabilities Analysis (RCA) on the core and std libraries	21.2±0.31ms	21.2±0.29ms	0.00%
Teleport evaluation	81.0±3.70µs	80.2±3.54µs	-0.99%

[minestarks]

I'm amazed by the simplicity of this fix. I was getting all twisted up imagining what sorts of infrastructure changes we'd need to do in the language service... But this is very clever and to the point. Thanks!

[github-actions]

Benchmark for 8774d9d

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Test	Base	PR	%
Array append evaluation	346.4±2.85µs	335.7±2.38µs	-3.09%
Array literal evaluation	203.0±3.65µs	177.0±1.58µs	-12.81%
Array update evaluation	431.3±2.69µs	418.0±1.53µs	-3.08%
Core + Standard library compilation	17.6±1.52ms	17.0±0.25ms	-3.41%
Deutsch-Jozsa evaluation	5.0±0.09ms	5.0±0.04ms	0.00%
Large file parity evaluation	33.8±0.19ms	33.7±0.23ms	-0.30%
Large input file compilation	11.2±0.24ms	11.4±0.35ms	+1.79%
Large input file compilation (interpreter)	43.4±1.18ms	43.7±1.26ms	+0.69%
Large nested iteration	33.8±0.33ms	32.6±0.37ms	-3.55%
Perform Runtime Capabilities Analysis (RCA) on Deutsch-Jozsa sample	1518.7±65.96µs	1493.4±34.50µs	-1.67%
Perform Runtime Capabilities Analysis (RCA) on large file sample	7.9±0.11ms	8.0±0.14ms	+1.27%
Perform Runtime Capabilities Analysis (RCA) on teleport sample	1424.4±33.03µs	1407.6±63.76µs	-1.18%
Perform Runtime Capabilities Analysis (RCA) on the core and std libraries	21.5±0.39ms	21.3±0.27ms	-0.93%
Teleport evaluation	80.4±3.41µs	80.7±3.80µs	+0.37%

[github-actions]

Benchmark for f6dc3be

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Test	Base	PR	%
Array append evaluation	341.6±22.29µs	345.8±2.20µs	+1.23%
Array literal evaluation	177.1±4.51µs	195.4±1.20µs	+10.33%
Array update evaluation	423.7±22.62µs	429.9±1.65µs	+1.46%
Core + Standard library compilation	16.8±0.32ms	18.2±0.66ms	+8.33%
Deutsch-Jozsa evaluation	5.0±0.06ms	5.0±0.04ms	0.00%
Large file parity evaluation	33.7±0.16ms	33.7±0.39ms	0.00%
Large input file compilation	11.2±0.14ms	12.0±0.31ms	+7.14%
Large input file compilation (interpreter)	43.0±0.98ms	48.1±1.70ms	+11.86%
Large nested iteration	33.0±2.13ms	33.8±0.28ms	+2.42%
Perform Runtime Capabilities Analysis (RCA) on Deutsch-Jozsa sample	1490.7±26.37µs	1515.1±72.86µs	+1.64%
Perform Runtime Capabilities Analysis (RCA) on large file sample	7.7±0.12ms	7.8±0.09ms	+1.30%
Perform Runtime Capabilities Analysis (RCA) on teleport sample	1407.3±33.61µs	1427.3±71.35µs	+1.42%
Perform Runtime Capabilities Analysis (RCA) on the core and std libraries	21.2±0.16ms	21.8±1.10ms	+2.83%
Teleport evaluation	80.1±3.96µs	81.4±11.65µs	+1.62%