Add sqlite3 interface

[aerorahul]

Description This PR:

• adds a simple interface to interact with a sqlite3 database

Type of change

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

How Has This Been Tested?

• [X] pynorms
• [X] 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[bot]]

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 :warning:

Additional details and impacted files

```diff @@ 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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