[OneCollector] Registration extension + tenant token tweaks

[CodeBlanch]

Changes

• Tenant token is now parsed automatically from the instrumentation key
• Registration extensions now operate on a builder instead of options directly. This is kind of a WIP I think it will make things easier as more and more features get added. But it may be removed before stable.

TODOs

• Appropriate CHANGELOG.md updated for non-trivial changes
• Changes in public API reviewed

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@e080a57). Click here to learn what that means.
The diff coverage is 55.31%.

❗ Current head b9d7f62 differs from pull request most recent head bd06696. Consider uploading reports for the commit bd06696 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1032   +/-   ##
=======================================
  Coverage        ?   69.44%           
=======================================
  Files           ?      200           
  Lines           ?     7631           
  Branches        ?        0           
=======================================
  Hits            ?     5299           
  Misses          ?     2332           
  Partials        ?        0           

Impacted Files	Coverage Δ
...neCollector/Logs/OneCollectorLogExporterOptions.cs	90.90% <ø> (ø)
...eCollector/OneCollectorExporterTransportOptions.cs	72.22% <ø> (ø)
...neCollector/Logs/OneCollectorLogExporterBuilder.cs	31.81% <31.81%> (ø)
...neCollectorOpenTelemetryLoggerOptionsExtensions.cs	76.00% <64.70%> (ø)
...porter.OneCollector/OneCollectorExporterOptions.cs	100.00% <100.00%> (ø)

[reyang]

Not blocking this PR - maybe use "ConnectionString" and get rid of these domain specific concepts (as they always change).

[CodeBlanch]

Opened #1037