feat: New service exposing CPU, memory, etc profiling information

[dadrus]

Related issue(s)

closes #445

Checklist

• I agree to follow this project's Code of Conduct.
• I have read, and I am following this repository's Contributing Guidelines.
• I have read the Security Policy.
• I have referenced an issue describing the bug/feature request.
• I have added tests that prove the correctness of my implementation.
• I have updated the documentation.

Description

This PR implements a new service, which if enabled exposes profiling information on port 4458 (configurable) with following paths:

• /debug/pprof - responds with an HTML page listing the available profiles (see below)
• /debug/pprof/cmdline - responds with the running program's command line, with arguments separated by NUL bytes
• /debug/pprof/profile - responds with the pprof-formatted cpu profile. Profiling lasts for duration specified in seconds parameter, or for 30 seconds if not specified
• /debug/pprof/symbol - looks up the program counters listed in the request, responding with a table mapping program counters to function names
• /debug/pprof/trace - responds with the execution trace in binary form. Tracing lasts for duration specified in seconds GET parameter, or for 1 second if not specified.

The configuration of this service happens in the profiling config property and supports the following values:

enabled: false # or true. false is default
host: "127.0.0.1" # loopback interface only. So must be set to another value if operated in docker.
port: 4458

The helm chat has been updated as well to support the configuration of this new service in sense of the exposed port (same value as above) und the ip this service is listenimg to. Latter is set to 0.0.0.0 to enable the usage by corresponding agents without the need for additional configuration. If enabled, it also sets annotations for Phlare to let an available phlare installation scrape the corresponding information. If Phlare is not installed, the annotations do not have any effect. The helm chart does not create a k8s service for this port.

[codecov]

Codecov Report

Merging #446 (e8c05b6) into main (f00e0ec) will decrease coverage by 0.22%.
The diff coverage is 16.66%.

@@            Coverage Diff             @@
##             main     #446      +/-   ##
==========================================
- Coverage   88.17%   87.96%   -0.22%     
==========================================
  Files         200      202       +2     
  Lines        8053     8077      +24     
==========================================
+ Hits         7101     7105       +4     
- Misses        780      800      +20     
  Partials      172      172              

Impacted Files	Coverage Δ
internal/config/configuration.go	100.00% <ø> (ø)
internal/config/profiling.go	0.00% <0.00%> (ø)
internal/handler/profiling/module.go	17.39% <17.39%> (ø)

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