Add ar1_noise synth. data routine

[tensionhead]

Changes Summary

• also renamed AR2_network to ar2_network

Reviewer Checklist

• Are testing routines present?
• Do objects in the global package namespace perform proper parsing of their input?
• Are all docstrings complete and accurate?
• Is the CHANGELOG.md up to date?

[codecov]

Codecov Report

Patch coverage: 54.54% and project coverage change: +0.08 🎉

Comparison is base (ad755d6) 68.95% compared to head (7087029) 69.03%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #503      +/-   ##
==========================================
+ Coverage   68.95%   69.03%   +0.08%     
==========================================
  Files          87       87              
  Lines       10162    10164       +2     
  Branches     2073     2072       -1     
==========================================
+ Hits         7007     7017      +10     
  Misses       2617     2617              
+ Partials      538      530       -8     

Impacted Files	Coverage Δ
syncopy/synthdata/utils.py	100.00% <ø> (ø)
syncopy/tests/backend/test_fooofspy.py	85.00% <0.00%> (ø)
syncopy/tests/local_spy.py	0.00% <ø> (ø)
syncopy/synthdata/analog.py	72.05% <50.00%> (-3.75%)	⬇️
syncopy/tests/backend/test_conn.py	100.00% <100.00%> (ø)

... and 4 files with indirect coverage changes

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