feat: Use structured logging for internal logs

[chynesNR]

This gives us:

• Full exception info and stack trace for all errors
• No longer need separate "Format" versions of logging functions (e.g. DebugFormat, FinestFormat, etc) or separate exception logging functions

I also removed some redundant if [Debug]Enabled Log.[Debug] checks.

Two areas that could still use some cleanup:

• I didn't convert any string interpolation to use a structured log line, only explicit calls to the Format methods
• Transaction.LogFinest() could probably use a little restructuring to avoid all the checks if Finest is enabled

Resolves #1667

[codecov-commenter]

Codecov Report

Merging #1903 (430fc4f) into main (9399c0a) will increase coverage by 0.13%.
Report is 6 commits behind head on main.
The diff coverage is 58.97%.

@@            Coverage Diff             @@
##             main    #1903      +/-   ##
==========================================
+ Coverage   83.39%   83.52%   +0.13%     
==========================================
  Files         402      402              
  Lines       24694    24593     -101     
==========================================
- Hits        20593    20541      -52     
+ Misses       4101     4052      -49     

Files Changed	Coverage Δ
src/Agent/NewRelic/Agent/Core/Agent.cs	77.36% <0.00%> (ø)
...t/NewRelic/Agent/Core/AgentInstallConfiguration.cs	77.45% <0.00%> (ø)
...ent/Core/Aggregators/MetricStatsCollectionQueue.cs	84.61% <0.00%> (ø)
...rc/Agent/NewRelic/Agent/Core/Api/AgentBridgeApi.cs	50.90% <0.00%> (ø)
...ewRelic/Agent/Core/Api/DistributedTraceApiModel.cs	83.33% <ø> (ø)
src/Agent/NewRelic/Agent/Core/Api/SpanBridgeApi.cs	0.00% <0.00%> (ø)
.../Agent/Core/Attributes/AttributeValueCollection.cs	78.59% <0.00%> (ø)
...rowserMonitoring/BrowserMonitoringPrereqChecker.cs	85.18% <0.00%> (ø)
.../NewRelic/Agent/Core/CallStack/CallStackManager.cs	53.00% <0.00%> (ø)
...gent/Core/Commands/InstrumentationUpdateCommand.cs	66.66% <0.00%> (ø)
... and 60 more

... and 1 file with indirect coverage changes