Add programming language selector

[grcevski]

This PR implements the second part of the issue, to take the input from the language detector and use it to be able to select programming languages to instrument. This can be especially useful for deployment in non Kubernetes environments alongside the OpenTelemetry Injector or with the OpenTelemetry operator in daemonset mode.

Here's an example on how we can use this:

services:
  instrument:
    - language: {go,rust}

With this configuration option OBI will instrument all services found on the host that are implemented in golang or rust.

I'll follow-up with a docs PR for opentelemetry.io when the change is merged.

Closes #1302

[mariomac]

Amazing! What about adding also an OTEL_EBPF_AUTO_TARGET_LANGUAGE environment variable?

[codecov]

Codecov Report

❌ Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 43.58%. Comparing base (7475bff) to head (48486a4).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/appolly/discover/matcher.go	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1326      +/-   ##
==========================================
+ Coverage   43.51%   43.58%   +0.06%     
==========================================
  Files         305      305              
  Lines       32864    32877      +13     
==========================================
+ Hits        14301    14329      +28     
+ Misses      17643    17628      -15     
  Partials      920      920              

Flag	Coverage Δ
integration-test	21.48% <36.36%> (-0.01%)	⬇️
integration-test-arm	0.00% <0.00%> (ø)
integration-test-vm-x86_64-5.15.152	0.00% <0.00%> (ø)
integration-test-vm-x86_64-6.10.6	0.00% <0.00%> (ø)
k8s-integration-test	2.36% <0.00%> (-0.01%)	⬇️
oats-test	0.00% <0.00%> (ø)
unittests	44.37% <90.90%> (+0.08%)	⬆️

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[grcevski]

Amazing! What about adding also an OTEL_EBPF_AUTO_TARGET_LANGUAGE environment variable?

Good idea! I'll follow-up with a PR on that. It can be handy.

[grcevski]

Amazing! What about adding also an OTEL_EBPF_AUTO_TARGET_LANGUAGE environment variable?

Good idea! I'll follow-up with a PR on that. It can be handy.

Added here #1331