Add aarch64 wheel build support

[odidev]

Added aarch64 wheel build support.
Related to #245, @althonos Could you please review this PR?

[althonos]

@odidev : I allowed you to run the GH actions, you should be able to test your changes now.

[odidev]

I’m facing the following Assertion Error on running tests.

FAIL: load_graph (fastobo) 
Doctest: fastobo.load_graph 
---------------------------------------------------------------------- 
Traceback (most recent call last): 
  File "/opt/python/cp37-cp37m/lib/python3.7/doctest.py", line 2204, in runTest 
    raise self.failureException(self.format_failure(new.getvalue())) 
AssertionError: Failed doctest test for fastobo.load_graph 
  File "/ws/fastobo.cpython-37m-aarch64-linux-gnu.so", line unknown line number, in load_graph 

---------------------------------------------------------------------- 
File "/ws/fastobo.cpython-37m-aarch64-linux-gnu.so", line ?, in fastobo.load_graph 
Failed example: 
    doc[0] 
Expected:
    TermFrame(PrefixedIdent('BFO', '0000002')) 
Got: 
    TermFrame(PrefixedIdent('BFO', '0000001')) 

---------------------------------------------------------------------- 

Ran 125 tests in 10.934s

FAILED (failures=1, expected failures=3)

Also this error is seen in x86. Is it an expected error? Could you please have a look?

[althonos]

@odidev : this was an issue with one of the doctests failing, I have pushed a fix to the main branch, you can pull from that and it should fix it.

[odidev]

Done.

[codecov]

Codecov Report

Merging #246 (755bc19) into master (a01bdf0) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #246      +/-   ##
==========================================
+ Coverage   34.69%   34.71%   +0.02%     
==========================================
  Files          24       24              
  Lines        3678     3678              
==========================================
+ Hits         1276     1277       +1     
+ Misses       2402     2401       -1     

Impacted Files	Coverage Δ
src/py/mod.rs	76.00% <0.00%> (-2.00%)	⬇️
src/py/id.rs	59.48% <0.00%> (-0.52%)	⬇️
src/py/term/clause.rs	27.80% <0.00%> (-0.17%)	⬇️
src/py/typedef/clause.rs	11.95% <0.00%> (-0.10%)	⬇️
src/py/pv.rs	69.91% <0.00%> (+0.81%)	⬆️
src/py/doc.rs	78.66% <0.00%> (+1.33%)	⬆️
src/error.rs	50.00% <0.00%> (+1.47%)	⬆️
src/iter.rs	58.16% <0.00%> (+3.06%)	⬆️

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[althonos]

Thanks a bunch! I'll be making a new postrelease to get the wheels on PyPI.