feat: generate OAuth2 Scopes and Descriptions variables

[paragon]

This change is underpinned by a new ScopeDescriptions map on the Security struct that contains a mapping of scope => scopeDescription.

We leverage this in three areas:

1. When there are one or more scopes with a description, we create a type ScopeName = string alias.
2. Using the ScopeName alias, we iterate over all Scopes and create consts for each Scope (with its corresponding scope string) and create a Map containing a mapping of ScopeName => ScopeDescription.
3. We update the oauth2Scopes Map to include ScopeName aliased Scopes, rather than raw strings.