Add a context manager for zipping FASTX files

[clintval]

Helpful addition? Docs appear to render correctly on my local machine:

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (66b2200) 92.88% compared to head (06f9a85) 93.27%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
fgpyo/fastx/__init__.py	95.12%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
+ Coverage   92.88%   93.27%   +0.38%     
==========================================
  Files          30       32       +2     
  Lines        3122     3331     +209     
  Branches      581      618      +37     
==========================================
+ Hits         2900     3107     +207     
- Misses        148      149       +1     
- Partials       74       75       +1     

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[nh13]

Shall we suggest adding this to pysam to the pysam developers?

[clintval]

Shall we suggest adding this to pysam to the pysam developers?

What's been your approach on this for pysam vs fgpyo? I'm up for it!

I have a few more PRs to make in pysam for all matter of wrong docs, bugs, and features I recently found.

[nh13]

What's been your approach on this for pysam vs fgpyo? I'm up for it!

I ask first, and it's nice that you can point it to here (and we can even merge it!)

[clintval]

I want to add one more defensive check to make sure the class isn't used as an Iterator outside of the context manager context (which would result in a bug). Just thought of that edge case prior to merge!

[clintval]

@nh13 I added one more commit and feel good with the functionality.

Let me know if you'd like to re-review!

[nh13]

No need for me to re review. Ship it!