feat(build-cli): New command generate:changeset-config to generate dynamic changeset config

[tylerbutler]

Work in progress.

Primary goal is to enable us to dynamically allocate fixed and linked version groups in the changeset config.

[msfluid-bot]

⯅ @fluid-example/bundle-size-tests: +245 Bytes

Metric Name	Baseline Size	Compare Size	Size Diff
aqueduct.js	453.07 KB	453.11 KB	⯅ +35 Bytes
azureClient.js	551.1 KB	551.15 KB	⯅ +49 Bytes
connectionState.js	680 Bytes	680 Bytes	■ No change
containerRuntime.js	255.81 KB	255.82 KB	⯅ +14 Bytes
fluidFramework.js	384.59 KB	384.61 KB	⯅ +14 Bytes
loader.js	134.01 KB	134.03 KB	⯅ +14 Bytes
map.js	41.1 KB	41.11 KB	⯅ +7 Bytes
matrix.js	144.48 KB	144.49 KB	⯅ +7 Bytes
odspClient.js	519.17 KB	519.22 KB	⯅ +49 Bytes
odspDriver.js	97.21 KB	97.23 KB	⯅ +21 Bytes
odspPrefetchSnapshot.js	42.21 KB	42.22 KB	⯅ +14 Bytes
sharedString.js	160.99 KB	160.99 KB	⯅ +7 Bytes
sharedTree.js	375.06 KB	375.06 KB	⯅ +7 Bytes
Total Size	3.23 MB	3.23 MB	⯅ +245 Bytes

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Baseline commit: ef6618f51e4aa137de08b326e59cd3b364883171

Generated by :no_entry_sign: dangerJS against 7659ea03c7ba4492ea055d865870dd3edf057522

[microsoft-github-policy-service[bot]]

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