Add `SpiceNOTENOUGHDATA2` exception

[cgobat]

I encountered a SPICE(NOTENOUGHDATA2) error which had no corresponding exception class in SpiceyPy. This PR adds it to exceptions.py.

[codecov[bot]]

Codecov Report

Merging #466 (a716650) into main (141fe4d) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #466   +/-   ##
=======================================
  Coverage   99.86%   99.86%           
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  Files          13       13           
  Lines       15633    15635    +2     
=======================================
+ Hits        15612    15614    +2     
  Misses         21       21           

Impacted Files	Coverage Δ
src/spiceypy/utils/exceptions.py	100.00% <100.00%> (ø)

[AndrewAnnex]

LGTM! thanks @cgobat