Introduce InstrumentationConfigurator

[breedx-splk]

Currently, we have a limitation in that AutoService instrumentations that are automatically found and loaded on the classpath cannot really be customized. The service loader just loads them and then immediately calls install. This limits users ability to tweak specific instrumentations to their needs.

So this PR adds a new interface called InstrumentationConfigurator. Implementations of this are found on the classpath, loaded by the service loader, and then they are invoked with the instrumentation before install() is called. The instances have a name field, and this name field allows the configurator to be linked/matched to the correct instrumentation.

We already have the DSL, but we cannot create type-specific DSL wrappers for 3rd party or other user-specific instrumentations. We should expect to see 1st party instrumentation libraries, and we want there to be a nice, uniform way of configuring these.

If we like this approach, then later on we could consider adding support for InstrumentationConfigurator in the DSL as well.

[codecov]

Codecov Report

❌ Patch coverage is 62.50000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.90%. Comparing base (37ae421) to head (b723d2e).

Files with missing lines	Patch %	Lines
...tion/library/httpurlconnection/AddTestExtractor.kt	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1783      +/-   ##
==========================================
- Coverage   62.99%   62.90%   -0.09%     
==========================================
  Files         157      159       +2     
  Lines        3448     3464      +16     
  Branches      352      353       +1     
==========================================
+ Hits         2172     2179       +7     
- Misses       1179     1187       +8     
- Partials       97       98       +1     

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