Add support for directly generating span graphs

[grcevski]

Some initial code for generation of span graphs directly from Beyla. The basic design is as follows:

• Look to match a service by the calculated svc.ID.
• If you can't find it, use k8s (if enabled) and DNS to resolve the name.
• Cache all lookups to ensure we don't spam the DNS.
• Works properly across different nodes if the DNS agrees with the service name configured for OTel. If they don't then service graphs will be partial.

TODO:

• [x] Prometheus scrape support
• [x] Unit tests
• [x] Integration tests
• [x] Docs

[mariomac]

The following PR does the merge with origin/main. It just resolves the reported conflict in the instrumenter.go file, adapting the current code to the new pipes API. Despite the big size of the PR (it adds all the changes from main into your branch), I have only slightly changed the pipeline.go and name_resolver.go files.

https://github.com/grcevski/ebpf-autoinstrument/pull/4

[grcevski]

The following PR does the merge with origin/main. It just resolves the reported conflict in the instrumenter.go file, adapting the current code to the new pipes API. Despite the big size of the PR (it adds all the changes from main into your branch), I have only slightly changed the pipeline.go and name_resolver.go files.

grcevski#4

Thanks a bunch Mario!

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.60942% with 70 lines in your changes are missing coverage. Please review.

Project coverage is 67.91%. Comparing base (fe9ac27) to head (b517207).

Files	Patch %	Lines
pkg/internal/export/otel/metrics.go	55.84%	23 Missing and 11 partials :warning:
pkg/internal/export/prom/prom.go	76.11%	12 Missing and 4 partials :warning:
pkg/transform/name_resolver.go	88.23%	10 Missing and 4 partials :warning:
pkg/internal/transform/kube/db.go	90.32%	3 Missing :warning:
pkg/internal/export/otel/traces.go	87.50%	2 Missing :warning:
pkg/beyla/network_cfg.go	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #745 +/- ## ========================================== + Coverage 67.41% 67.91% +0.49% ========================================== Files 102 103 +1 Lines 8853 9181 +328 ========================================== + Hits 5968 6235 +267 - Misses 2445 2489 +44 - Partials 440 457 +17 ``` | [Flag](https://app.codecov.io/gh/grafana/beyla/pull/745/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=grafana) | Coverage Δ | | |---|---|---| | [integration-test](https://app.codecov.io/gh/grafana/beyla/pull/745/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=grafana) | `67.91% <80.60%> (+0.49%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=grafana#carryforward-flags-in-the-pull-request-comment) to find out more.

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