sx-method-call rewritten and associated improvements in sx-request.

Now requires `'sx-auth` to account for authentication.

(sx-method-call) is now defined using `cl-defun` and uses keys rather
than positional arguments.

Authentication logic is performed in `sx-method-call` to ensure commands
are only passed on once they are needed.

When access token is available:
  - Filters will be used as provided
  - Methods will be called
When access token is unavailable:
  - Filters will downgrade to only request object that do not require
    auth.
  - Methods will instead use `sx-request-fallback` and return nil.

If auth is not specified but is required, `sx-method-call` will throw an
error.  If auth is specified as `'warn`, `user-error` will be called.

(sx-request--build-keyword-arguments) has been simplified.  It will
always pass an available access_token (api indicates doing so will use a
user/key quota rather than simply key quota).

(sx-request-make) now performs url retrieval directly.  Query
construction is all performed by `sx-method-call`.

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