[db] add ability to enable SSL for database connection

[drew-u410]

• Adds the ability to enable SSL for the database connection.
• Maintains existing default behavior of not being enabled.
• Adds tests for setting options and default options on the database connection.

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Ran tests locally and they pass as expected:

$ POSTGRES_TEST_DATABASE=test POSTGRES_TEST_PASSWORD=test POSTGRES_TEST_USERNAME=test POSTGRES_TEST_HOST=localhost yarn test

Once this is merged, I intend to open PRs for graphprotocol/indexer to update if accepted.

Thank you.

[fordN]

LGTM 👍 Thanks for the contribution, @drew-u410!

[drew-u410]

LGTM 👍 Thanks for the contribution, @drew-u410!

Np- do you intend to merge? If so, on what timeline? I would like to prepare an indexer MR but I can't do so until this is able to be used.