feat(system): add db constants to __all__

[cesarcoatl]

PR Checklist

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• The commit message follows our commit message format.

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

When running mypy we get errors saying the db module does not have BIT, for example.

Issue Number: #34

What is the new behavior?

Adding the constants to __all__ will fix the error reported in #34.

Does this PR introduce a breaking change?

• Yes
• No

Other information

[sourcery-ai]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 1.13%.

Quality metrics	Before	After	Change
Complexity	0.00 ⭐	0.00 ⭐	0.00
Method Length	22.24 ⭐	23.66 ⭐	1.42 👎
Working memory	3.66 ⭐	3.66 ⭐	0.00
Quality	87.92% ⭐	86.79% ⭐	-1.13% 👎

Other metrics	Before	After	Change
Lines	763	804	41

Changed files	Quality Before	Quality After	Quality Change
src/system/db.py	87.92% ⭐	86.79% ⭐	-1.13% 👎

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
src/system/db.py	addDatasource	0 ⭐	41 ⭐	12 😞	74.31% 🙂	Extract out complex expressions
src/system/db.py	runPrepUpdate	0 ⭐	31 ⭐	10 😞	79.58% ⭐	Extract out complex expressions

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