WIP: customizer all the things

[codefromthecrypt]

This adds hooks for new customizers that will be in Brave 5.7. As I'll
be offline for a day or two, if anyone wants to play with this they can.

We could just weave-in and document this, or we could retrofit some of
our existing stuff to configure itself via customizers instead (ex MDC
integration).

cc @devinsba

[codecov]

Codecov Report

Merging #1436 into master will decrease coverage by 0.04%.
The diff coverage is 36.84%.

@@             Coverage Diff              @@
##             master    #1436      +/-   ##
============================================
- Coverage     57.61%   57.57%   -0.05%     
- Complexity      794      795       +1     
============================================
  Files           150      150              
  Lines          4287     4304      +17     
  Branches        460      464       +4     
============================================
+ Hits           2470     2478       +8     
- Misses         1606     1612       +6     
- Partials        211      214       +3

Impacted Files	Coverage Δ	Complexity Δ
...loud/sleuth/autoconfig/TraceAutoConfiguration.java	69.87% <25%> (-7.59%)	21 <0> (ø)
...uth/instrument/web/TraceHttpAutoConfiguration.java	73.8% <57.14%> (-4.57%)	8 <0> (ø)
...trument/reactor/TraceReactorAutoConfiguration.java	92% <0%> (+4%)	1% <0%> (ø)	⬇️
...uth/instrument/async/TraceableExecutorService.java	76.74% <0%> (+4.65%)	23% <0%> (+1%)	⬆️

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[codecov]

Codecov Report

Merging #1436 into master will decrease coverage by 0.11%.
The diff coverage is 36.84%.

@@             Coverage Diff              @@
##             master    #1436      +/-   ##
============================================
- Coverage     57.23%   57.12%   -0.12%     
- Complexity      777      779       +2     
============================================
  Files           148      148              
  Lines          4242     4259      +17     
  Branches        457      461       +4     
============================================
+ Hits           2428     2433       +5     
- Misses         1603     1611       +8     
- Partials        211      215       +4

Impacted Files	Coverage Δ	Complexity Δ
...loud/sleuth/autoconfig/TraceAutoConfiguration.java	69.87% <25%> (-7.59%)	21 <0> (ø)
...uth/instrument/web/TraceHttpAutoConfiguration.java	73.8% <57.14%> (-4.57%)	8 <0> (ø)

---

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[marcingrzejszczak]

Lgtm

I'd refactor what we have to use the customizers I guess

[connectwithnara]

@marcingrzejszczak Netflix needs this. Could you include it in 2.1.3. Thanks.

@adriancole fyi

[shakuzen]

Brave 5.7 is being released now.

[codefromthecrypt]

this is now on a stable release. needs tests and docs.. not sure if you have time for it @marcingrzejszczak but I'm offline until monday. hoping to get this in (also 2.1) to unlock the secondary sampling thing nara's hoping to roll out.

[codefromthecrypt]

ps without tests this is subtle. it is important these apply last as they can rejig the reporter config, something needed for secondary sampling to work. ex we want to flip default reporter to noop but reuse the normal reporter as a finished span handler. this stuff works when customizes hit last before build

[codefromthecrypt]

bravo!

…

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