getQueryVariables is not typed

[TylerBreau]

Request.getQueryVariables is typed any. There is no current way for usages of @breautek/storm to define and have the typings be enforced.

Unfortunately fixing the typings is not super easy. The @type/express typings for express.Request.query originate from the types for the qs library.
There is some middlemen in the typings but it ultimately maps to qs' ParsedQs.

interface ParsedQs { [key: string]: undefined | string | string[] | ParsedQs | ParsedQs[] }

During a discussion between @breautek and I in slack, it was decided that...

storm only supports what Record<string, string | string[]>

Fixing this issue would require...

1. Adding a new generic to Request that extends/implements/defaults to Record<string, string | Array<string>>
2. Updating the return type of getQueryVariables to the new generic. In order to satisfy typings, you will have to force retype this.$request.query by doing <NewGeneric><unknown> this.$request.query
3. Handler's TGetRequest currently maps to the TBody. This either needs to be updated to map to the query variables generic, or a new generic needs to be added to Handler.