Quote grantees when granting or revoking for Redshift

[khuston]

resolves #172

Problem

Identifiers are not quoted in grant and revoke statements for Redshift. This causes errors when an identifier contains certain characters such as .

Solution

Identifiers are now quoted in grant and revoke statements. Because identifiers can be preceded by the reserved words role or group, we separate those reserved keywords before quoting and then rejoin with a space.

• https://docs.aws.amazon.com/redshift/latest/dg/r_GRANT.html
• https://docs.aws.amazon.com/redshift/latest/dg/r_REVOKE.html

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX

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