Fix [CT-1200]: Skip grants on share objects

[aaron-ortega]

resolves #264

Description

Change grants logic to skip over shares and, for now, only handle roles.

Checklist

• I have read the contributing guide and understand what's expected of me
• I have signed the CLA
• 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
• I have opened an issue to add/update docs, or docs changes are not required/relevant for this PR
• I have run changie new to create a changelog entry

[ChenyuLInx]

Thanks for contributing! The change looks good to me!

How you feel about adding a test case for this? If not we can also add a note in the following issue about more complete feature you are requesting about shared object and do it there.

[aaron-ortega]

@ChenyuLInx if it's ok with you I would rather add tests for the complete feature

[ChenyuLInx]

Sounds good!! @aaron-ortega thanks for contributing this!!!