Setup SqlModel and Alembic

[moisses89]

Description

Add support SqlModel (based on SqlAlchemy).
Enable migrations management with Alembic.

Closes #8

[coveralls]

Pull Request Test Coverage Report for Build 12183076461

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 61 of 66 (92.42%) changed or added relevant lines in 7 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+16.4%) to 90.435%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
app/services/contract.py	16	17	94.12%
app/datasources/db/database.py	16	20	80.0%

Totals
Change from base Build 12119268343:	16.4%
Covered Lines:	104
Relevant Lines:	115

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💛 - Coveralls