Solo editing perf track local branch array

[yann-achard-MS]

Description

Before this PR, the "EditManager - Bench No concurrency Many local edits" benchmark reports the following times on a dev workstation:

status  name                                          period (ns/op)  relative margin of error  iterations per batch  batch count  total time (s)
------  --------------------------------------------  --------------  ------------------------  --------------------  -----------  --------------
    ✔   Process the sequencing of 1 local commits           1,317.27                    ±1.42%                     1       21,286            5.00
    ✔   Process the sequencing of 10 local commits          9,143.64                    ±1.00%                     1       11,520            0.92
    ✔   Process the sequencing of 100 local commits       356,412.61                    ±1.00%                     1          912            0.45
    ✔   Process the sequencing of 1000 local commits   27,710,768.29                    ±0.98%                     1           41            1.24

After this PR:

status  name                                          period (ns/op)  relative margin of error  iterations per batch  batch count  total time (s)
------  --------------------------------------------  --------------  ------------------------  --------------------  -----------  --------------
    ✔   Process the sequencing of 1 local commits           1,163.39                    ±2.21%                     1       19,962            5.00
    ✔   Process the sequencing of 10 local commits          4,308.33                    ±1.94%                     1       20,516            5.00
    ✔   Process the sequencing of 100 local commits        44,794.80                    ±1.00%                     1        5,599            0.95
    ✔   Process the sequencing of 1000 local commits      574,640.66                    ±1.00%                     1        2,319            3.26

Changes

The EditManager now maintains an array of commits that represents the changes on the local branch that are not yet on the trunk. This saves the EditManager manager from having to re-crawl the local branch every time a commit from the local branch is sequenced.

Breaking Change

No breaking changes

[yann-achard-MS]

This change is unrelated. I forgot to commit it in the previous PR.

[msfluid-bot]

⯅ @fluid-example/bundle-size-tests: +386 Bytes

Metric Name	Baseline Size	Compare Size	Size Diff
aqueduct.js	506.5 KB	506.54 KB	⯅ +44 Bytes
connectionState.js	680 Bytes	680 Bytes	■ No change
containerRuntime.js	241.29 KB	241.32 KB	⯅ +22 Bytes
loader.js	166.56 KB	166.58 KB	⯅ +22 Bytes
map.js	46.61 KB	46.62 KB	⯅ +11 Bytes
matrix.js	148.45 KB	148.46 KB	⯅ +11 Bytes
odspDriver.js	95.32 KB	95.36 KB	⯅ +33 Bytes
odspPrefetchSnapshot.js	41.58 KB	41.61 KB	⯅ +22 Bytes
sharedString.js	164.05 KB	164.06 KB	⯅ +11 Bytes
sharedTree.js	294.51 KB	294.71 KB	⯅ +199 Bytes
Total Size	1.81 MB	1.81 MB	⯅ +386 Bytes

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Baseline commit: 0302e83

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