Add boundaries to permissions

What does this MR do and why?

• Add boundaries to Authz::Permission class.
• Updates permission files which have available_for_tokens = true and adds a list of boundaries for them.
• Updates GraphQL query to return boundaries for each permission.

How to set up and validate locally

1. Enable feature flag in the rails console:

Feature.enable(:fine_grained_personal_access_tokens)

2. Log-in as any user and navigate to GraphQL explorer on /graphql-explorer and run the following query:

query {
  accessTokenPermissions {
    name  
    category  
    boundaries
  }
}

MR acceptance checklist

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Related to #577889