[WIP] Implement database engine for vault

[orblazer]

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Description

This PR implement support database engine for vault

Fixes: #270

Checklist

Please make sure that your PR fulfills the following requirements:

• [x] Reviewed the guidelines for contributing to this repository
• [x] The commit message follows the Conventional Commits Guidelines.
• [x] Tests for the changes have been updated
• [ ] Are you adding dependencies? If so, please run go mod tidy -compat=1.17 to ensure only the minimum is pulled in.
• [ ] Docs have been added / updated

Type of Change

• [x] Feature
• [x] New tests

Other information

TODO list :

• [x] output the database credentials
• [x] [test] create tests
• [x] [test] mount database engine
• [x] [test] create policies
• [ ] [test] configure database connection (This is currently bugged, i have the following error)

  vault_test.go:32:  Error making API request.
  
  URL: PUT https://127.0.0.1:33337/v1/database/config/testing
  Code: 404. Errors:
  
  * no handler for route "database/config/testing". route entry not found.
  

• [ ] [test] configure database dynamic credentials (I need to know what database i can use)

[CLAassistant]

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[sakiib]

Hi @orblazer, regarding the error you're getting * no handler for route "database/config/testing". route entry not found. I think that's because the SecretEngine in path database hasn't been successfully enabled at Line 139, pkg/helpers/test_helpers.go.

client.Sys().Mount("database", &api.MountInput{
		Type: "database",
	})

client.Sys().Mount() method returns an error if not successful, you should handle that error.

[orblazer]

@sakiib yeah that is only first commit, i still search how i can run the tests for try it (but for that i need implement SQLLite or something else)