0.34 Port: Add Event to MergeTree and Sequence on Local Segment Op Ack (#5045)

[anthony-murphy]

Emit a new maintenance event, ACKNOWLEDGED when the op is round tripped from the server and the local segment is ack

[msfluid-bot]

⯆ @fluidframework/base-host: -32 Bytes

Metric Name	Baseline Size	Compare Size	Size Diff
main.js	169.44 KB	169.41 KB	⯆ -32 Bytes
Total Size	169.44 KB	169.41 KB	⯆ -32 Bytes

⯅ @fluid-example/bundle-size-tests: +392 Bytes

Metric Name	Baseline Size	Compare Size	Size Diff
container.js	193.96 KB	193.96 KB	■ No change
map.js	45.92 KB	45.92 KB	■ No change
matrix.js	144.44 KB	144.59 KB	⯅ +155 Bytes
odspDriver.js	195.83 KB	195.89 KB	⯅ +60 Bytes
sharedString.js	158.48 KB	158.65 KB	⯅ +177 Bytes
Total Size	738.63 KB	739.01 KB	⯅ +392 Bytes

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Baseline commit: 0ad3057

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