Add more friendly error when writing recording with multiple offsets

[h-mayorquin]

Related to #1106.

This produces error that look like this which should offer better diagnosis to users on which channels are the source of heterogeneity:

        "Recording extractors with heterogeneous offsets are not supported.",
        "Multiple offsets were found per channel IDs:",
        "  Offset 0: Channel IDs ['a', 'b']",
        "  Offset 1: Channel IDs ['c', 'd']",
        "  Offset 2: Channel IDs ['e']",

[alessandratrapani]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.59%. Comparing base (36464df) to head (0a3f749).
Report is 23 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1111      +/-   ##
==========================================
+ Coverage   90.44%   90.59%   +0.15%     
==========================================
  Files         129      129              
  Lines        8055     8187     +132     
==========================================
+ Hits         7285     7417     +132     
  Misses        770      770              

Flag	Coverage Δ
unittests	90.59% <100.00%> (+0.15%)	⬆️

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Files with missing lines	Coverage Δ
...c/neuroconv/tools/spikeinterface/spikeinterface.py	91.08% <100.00%> (+0.31%)	⬆️

... and 2 files with indirect coverage changes