Add always_write_timestamps method to base recording interfaces

[h-mayorquin]

Should close #712.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.46%. Comparing base (36464df) to head (cfe26a0).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1091      +/-   ##
==========================================
+ Coverage   90.44%   90.46%   +0.02%     
==========================================
  Files         129      129              
  Lines        8055     8055              
==========================================
+ Hits         7285     7287       +2     
+ Misses        770      768       -2     

Flag	Coverage Δ
unittests	90.46% <100.00%> (+0.02%)	⬆️

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Files with missing lines	Coverage Δ
...erfaces/ecephys/baserecordingextractorinterface.py	93.81% <ø> (ø)
...c/neuroconv/tools/spikeinterface/spikeinterface.py	90.85% <100.00%> (+0.08%)	⬆️

... and 1 file with indirect coverage changes