docs: update documentation, add docstrings, and add Aqua tests

[zsoerenm]

Preparation for version 1.0.0

• Add docstrings to all exported functions and types
• Update documentation to reflect API changes from recent refactors
• Convert documentation examples to doctests for automatic testing
• Remove obsolete tracking_results.md (TrackingResults was removed)
• Add docs/Project.toml for separate documentation environment
• Add GitHub Actions workflow for Documenter deployment
• Remove Documenter from main package dependencies
• Fix typo "und" -> "and" in downconvert_and_correlate_cpu.jl
• Fix incomplete docstring for DefaultPostCorrFilter
• Remove invalid export CPUSatDownconvertAndCorrelator
• Fix unbound type parameters in merge_sats function
• Move Adapt to weakdeps (only needed by CUDA extension)
• Add LinearAlgebra compat entry
• Add Aqua.jl tests for code quality checks

[github-actions]

Benchmark Results (Julia v1)

Time benchmarks

	master	a80f442...	master / a80f442...
downconvert and correlate/CPU/Float32	3.05 ± 0.021 μs	3 ± 0.021 μs	1.02 ± 0.01
downconvert and correlate/CPU/Float64	3.52 ± 0.029 μs	3.48 ± 0.02 μs	1.01 ± 0.01
downconvert and correlate/CPU/Int16	3.09 ± 0.021 μs	3.05 ± 0.029 μs	1.01 ± 0.012
downconvert and correlate/CPU/Int32	3.07 ± 0.029 μs	3.04 ± 0.029 μs	1.01 ± 0.014
track/Float32	3.35 ± 0.07 μs	3.33 ± 0.07 μs	1.01 ± 0.03
time_to_load	1.04 ± 0.023 s	0.995 ± 0.016 s	1.04 ± 0.029

Memory benchmarks

	master	a80f442...	master / a80f442...
downconvert and correlate/CPU/Float32	2 allocs: 0.359 kB	2 allocs: 0.359 kB	1
downconvert and correlate/CPU/Float64	2 allocs: 0.359 kB	2 allocs: 0.359 kB	1
downconvert and correlate/CPU/Int16	2 allocs: 0.359 kB	2 allocs: 0.359 kB	1
downconvert and correlate/CPU/Int32	2 allocs: 0.359 kB	2 allocs: 0.359 kB	1
track/Float32	12 allocs: 1.67 kB	12 allocs: 1.67 kB	1
time_to_load	0.145 k allocs: 11 kB	0.145 k allocs: 11 kB	1

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.50%. Comparing base (ed1c801) to head (a80f442).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #92      +/-   ##
==========================================
+ Coverage   80.30%   80.50%   +0.20%     
==========================================
  Files          23       23              
  Lines         660      667       +7     
==========================================
+ Hits          530      537       +7     
  Misses        130      130              

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