Add sqlite3 interface

[aerorahul]

Description
This PR:

• adds a simple interface to interact with a sqlite3 database

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How Has This Been Tested?

• pynorms
• pytests

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes need updates to the documentation. I have made corresponding changes to the documentation
• My changes generate no new warnings
• New and existing tests pass with my changes
• Any dependent changes have been merged and published

[codecov]

Codecov Report

Attention: Patch coverage is 92.98246% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 50.57%. Comparing base (dd9ca24) to head (3c60321).

Files	Patch %	Lines
src/wxflow/sqlitedb.py	92.85%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #17      +/-   ##
===========================================
+ Coverage    48.87%   50.57%   +1.70%     
===========================================
  Files           15       16       +1     
  Lines         1416     1473      +57     
  Branches       308      313       +5     
===========================================
+ Hits           692      745      +53     
- Misses         670      672       +2     
- Partials        54       56       +2     

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[TerrenceMcGuinness-NOAA]

Looks good, and I liked cleaning up my code with this. I did notice there was no tests for writing out a file.