fix: update sha.js (#2190)

feat: expose managers + some models (#2139)

* docs: add doc comments to the manager files

* feat: export manager classes

Export all manager files + the FileSystem class from models.
FileSystem is needed as an argument to many of the manager functions.

Managers + models can be import like so
`import {GitConfigManager, GitIndexManager} from "isomorphic-git/managers"`
`import {FileSystem} from "isomorphic-git/models"`

* docs: add docs for manager files

* build: output built to managers + models folders

* docs: update comments for FielSystem file

* docs: update website docs for FileSystem.js

* docs: fix file ids

* docs: update localized strings

* chore: update tsconfig

* docs: replace FileSystem with FSClient

* docs: update defaults

fix: improve hashblob performance up to 100% faster (#2144)

* refactor: directly return boolean expression

* perf: avoid creating new Uint8Array if it already is

* perf: avoid wrapping result in Uint8Array

`hashObject` already returns a `Uint8Array`

* perf: only create one buffer instead of three

* refactor: reintroduce explicit encoding

chore: update Android testing target on BrowserStack (#2136)

fix: mergeTree handles modifications in both trees (#2122)

Co-authored-by: aniket.bhosale <[email protected]>

feat: (merge --allow-unrelated-histories) adding parameter to merge u…

…nrelated branches (#2121)

* feat(merge--allow-unrelated-histories): adding parameter to merge branch with unrelated histories

* adding file and commit checks post merge

---------

Co-authored-by: aniket.bhosale <[email protected]>

fix: Handling of deleted trees on checkout (#2114)

* fix: handling of deleted trees on checkout

* chore: add entry in contributors-rc

* docs: update @gnillev as a contributor

* chore: add unit test

feat: Non-blocking checkout (#2108)

* feat: Non-blocking checkout

* removing console logs; changing dummy repo URL

* removing disabled test and perf time recording

* using isomorphic-git's dummy repo in test

---------

Co-authored-by: aniket.bhosale <[email protected]>

fix: merging when file is deleted from both branches (#2111)

* test: add case for merging when file is deleted from both branches

* fix: merging when file is deleted from both branches

* chore: fix typos in merge command and test

chore: update Azure VM (#2098)