Allow Sidebar to be Disabled

[CrossR]

Fixes #1562 and Fixes #2151.

@someguynamedmatt did the bulk of the work, I've just added the focus bits.

There is a few tiny bits here unrelated to the PR due to merging master onto a commit from a few months back and the pre-commit hook linting them.

[akinsho]

Looks good 👍

[codecov]

Codecov Report

Merging #2343 into master will decrease coverage by 0.03%.
The diff coverage is 6.66%.

@@            Coverage Diff             @@
##           master    #2343      +/-   ##
==========================================
- Coverage   37.55%   37.51%   -0.04%     
==========================================
  Files         299      299              
  Lines       12420    12435      +15     
  Branches     1640     1642       +2     
==========================================
+ Hits         4664     4665       +1     
- Misses       7507     7521      +14     
  Partials      249      249

Impacted Files	Coverage Δ
browser/src/Services/Sidebar/index.ts	36.84% <0%> (-2.05%)	⬇️
browser/src/Input/KeyBindings.ts	2.02% <0%> (-0.05%)	⬇️
browser/src/Services/Sidebar/SidebarStore.ts	11.42% <0%> (-1.21%)	⬇️
...rowser/src/Services/WindowManager/WindowManager.ts	67.27% <66.66%> (-0.32%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 82faff6...73da5d0. Read the comment docs.