Defaulting to native/exponential histograms

[mariomac]

Also updates documentation.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 43.68%. Comparing base (9327d77) to head (cc2b6f8).

Files with missing lines	Patch %	Lines
pkg/beyla/config.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2640      +/-   ##
==========================================
- Coverage   47.06%   43.68%   -3.39%     
==========================================
  Files          55       55              
  Lines        4723     4725       +2     
==========================================
- Hits         2223     2064     -159     
- Misses       2332     2521     +189     
+ Partials      168      140      -28     

Flag	Coverage Δ
beyla-integration-test	?
integration-test	?
integration-test-arm	0.00% <0.00%> (ø)
integration-test-vm-x86_64-5.15.152	?
integration-test-vm-x86_64-6.10.6	?
k8s-integration-test	?
oats-test	?
unittests	53.07% <100.00%> (+0.01%)	⬆️

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