Temporarily remove `compute_NASC`

[leewujung]

Temporarily remove commongrid.compute_NASC, because the current implementation of compute_NASC may contain unintended bugs related to units and a scaling factor. We'll add this back in v0.8.1.

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Codecov Report

Merging #1136 (4429311) into dev (3407147) will decrease coverage by 8.38%. The diff coverage is 100.00%.

:exclamation: Current head 4429311 differs from pull request most recent head 65f6596. Consider uploading reports for the commit 65f6596 to get more accurate results

@@            Coverage Diff             @@
##              dev    #1136      +/-   ##
==========================================
- Coverage   80.41%   72.04%   -8.38%     
==========================================
  Files          65        4      -61     
  Lines        6046      186    -5860     
==========================================
- Hits         4862      134    -4728     
+ Misses       1184       52    -1132     

Flag	Coverage Δ
unittests	72.04% <100.00%> (-8.38%)	:arrow_down:

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Files Changed	Coverage Δ
echopype/commongrid/api.py	94.33% <ø> (-1.07%)	:arrow_down:
echopype/commongrid/nasc.py	0.00% <ø> (-91.43%)	:arrow_down:
echopype/commongrid/__init__.py	100.00% <100.00%> (ø)

... and 61 files with indirect coverage changes

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