ENH: Use proj_create_crs_to_crs_from_pj for creating transformer PJ*

[snowman2]

Needed for #754

Attempted this in the past and had to revert (ref) due to instability in #412.

@cgohlke would you mind testing this with Windows to see if it works or if we should wait on this change?

[codecov]

Codecov Report

Merging #800 (6285edd) into master (8a19f39) will not change coverage.
The diff coverage is n/a.

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##           master     #800   +/-   ##
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  Coverage   95.08%   95.08%           
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  Files          21       21           
  Lines        1606     1606           
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  Hits         1527     1527           
  Misses         79       79           

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[snowman2]

Have an alternative in #803 that should be stable as it is essentially what is in PROJ now. However, if this PR worked, it would be preferred because it reduces the need to re-create additional PJ* objects. Due to the instability introduced in the past, I am hesitant to proceed with this.