style: use single quotes everywhere and add a rule to eslint

[blumamir]

Which problem is this PR solving?

The codebase is using a single quote for strings almost everywhere, but there is no such rule in eslint, and some files are written with double quotes and are not fixed automatically by the linter.

Short description of the changes

Add a rule for eslint: "quotes": [2, "single", { "avoidEscape": true }] and run lint:fix to replace double quotes with single quotes where it's not consistent.

[codecov]

Codecov Report

Merging #2351 (146433f) into main (56de304) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2351   +/-   ##
=======================================
  Coverage   92.89%   92.89%           
=======================================
  Files         143      143           
  Lines        5136     5136           
  Branches     1052     1052           
=======================================
  Hits         4771     4771           
  Misses        365      365           

Impacted Files	Coverage Δ
...ckages/opentelemetry-exporter-jaeger/src/jaeger.ts	90.90% <100.00%> (ø)
...ackages/opentelemetry-shim-opentracing/src/shim.ts	94.25% <100.00%> (ø)

[Flarna]

Seems quite some formatting rules got lost during removing gts/prettier.

[obecny]

lgtm