ASFProduct Subclassing

[SpicyGarlicAlbacoreRoll]

Breaks platform/processing level specific fields and aliases into subclasses, removes several non-common fields from base ASFProduct class.

• Adds the following subclasses, which asf-search uses when parsing results from CMR:
  • S1Product
  • S1BURSTProduct (subclasses S1Product class)
  • ALOSProduct
  • RadarsatProduct
  • AIRSARProduct
  • ERSProduct
  • JERSProduct
  • SEASATProduct
  • SIRCProduct
  • SMAPProduct
  • UAVSARProduct
• Moves baseline get_stack_opts() method into ASFProduct for subclasses to override
• Adds UMMFields module for common UMM property paths and aliases
• Adds BaselineCalcType enum class to ASFProduct, used to define perpendicular baseline calculation behavior for subclasses

[codecov-commenter]

Codecov Report

Attention: 36 lines in your changes are missing coverage. Please review.

Comparison is base (a5f017e) 89.79% compared to head (19ec81f) 89.73%.

Files	Patch %	Lines
asf_search/ASFSearchResults.py	27.77%	13 Missing :warning:
asf_search/Products/S1BURSTProduct.py	88.23%	4 Missing :warning:
asf_search/Products/ARIAS1GUNWProduct.py	82.35%	3 Missing :warning:
asf_search/Products/OPERAS1Product.py	92.10%	3 Missing :warning:
asf_search/export/jsonlite.py	72.72%	3 Missing :warning:
asf_search/ASFProduct.py	97.75%	2 Missing :warning:
asf_search/Products/AIRSARProduct.py	81.81%	2 Missing :warning:
asf_search/Products/SEASATProduct.py	80.00%	2 Missing :warning:
asf_search/ASFStackableProduct.py	97.50%	1 Missing :warning:
asf_search/Products/JERSProduct.py	92.30%	1 Missing :warning:
... and 2 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #225 +/- ## ========================================== - Coverage 89.79% 89.73% -0.06% ========================================== Files 54 69 +15 Lines 2028 2299 +271 ========================================== + Hits 1821 2063 +242 - Misses 207 236 +29 ``` | [Flag](https://app.codecov.io/gh/asfadmin/Discovery-asf_search/pull/225/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=asfadmin) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/asfadmin/Discovery-asf_search/pull/225/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=asfadmin) | `89.73% <92.87%> (-0.06%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=asfadmin#carryforward-flags-in-the-pull-request-comment) to find out more.

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