TYPE: Explicit optional & other fixes

[snowman2]

note: PEP 484 prohibits implicit Optional. Accordingly, mypy has changed its default to no_implicit_optional=True

https://peps.python.org/pep-0484/

Type checkers should move towards requiring the optional type to be made explicit.

[codecov]

Codecov Report

Merging #1179 (933d4e3) into main (8cfb95b) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1179   +/-   ##
=======================================
  Coverage   96.19%   96.19%           
=======================================
  Files          18       18           
  Lines        1707     1707           
=======================================
  Hits         1642     1642           
  Misses         65       65           

Impacted Files	Coverage Δ
pyproj/proj.py	97.72% <ø> (ø)
pyproj/sync.py	87.50% <ø> (ø)
pyproj/transformer.py	94.95% <ø> (ø)
pyproj/crs/crs.py	98.07% <100.00%> (ø)
pyproj/geod.py	97.38% <100.00%> (ø)

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