Add mysql_user importer

[winebarrel]

Add importer for mysql_user resource.

terraform import mysql_user.jdoe jdoe@localhost

[morganchristiansson]

Yesss! Please add terraform import mysql_user

[washingtoneg]

@davidji99, would you be able to review this? My apologies for the direct ping; my organization needs this and I would love to see this merged in upstream.

[davidji99]

Hi @washingtoneg,

Sure thing! No worries.

Two things on this PR for @winebarrel:

• Please update the documentation for this resource to reflect the newly added import functionality.
• Please provide an import test. You can refer to any import_* file in the Heroku provider for guidance. Once you have done so, paste the console output for a test run. I'll need to spend a bit of time to wire up Github Actions for CI.

Other than that, looks good.

[llomgui]

Hello,

Can you provide an update on this PR?
@winebarrel Do you need help with the documentation and tests?