Reorganizing Beyla configuration packages

[mariomac]

During the preparation for Asserts work and integration of multiple configuration sources, the import cycles became unmanageable.

To prepare future, deeper refactors, this PR does:

• renames package beyla to appobserv.
• creates a new beyla package and moves there all the configuration options. Now we have just a single beyla.Config structure, instead of the pipe.Config and its public facet beyla.Config.

[codecov-commenter]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (78e18f4) 79.63% compared to head (2978213) 44.95%.

Files	Patch %	Lines
pkg/internal/discover/finder.go	0.00%	5 Missing ⚠️
pkg/internal/discover/attacher.go	0.00%	1 Missing ⚠️
pkg/internal/discover/watcher_proc.go	0.00%	1 Missing ⚠️
pkg/internal/ebpf/httpfltr/httpfltr.go	0.00%	1 Missing ⚠️
pkg/internal/ebpf/httpssl/httpssl.go	0.00%	1 Missing ⚠️
pkg/internal/ebpf/watcher/watcher.go	0.00%	1 Missing ⚠️
pkg/internal/pipe/instrumenter.go	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #584       +/-   ##
===========================================
- Coverage   79.63%   44.95%   -34.68%     
===========================================
  Files          70       68        -2     
  Lines        5917     5739      -178     
===========================================
- Hits         4712     2580     -2132     
- Misses        980     3005     +2025     
+ Partials      225      154       -71     

Flag	Coverage Δ
integration-test	?
unittests	44.95% <21.42%> (+0.15%)	⬆️

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[grcevski]

LGTM! This is a great approach!