Sdk updates for proposed 1.1 spec

[mcintyre94]

Marking as draft because we'll want to coordinate this release so we don't confuse application developers. Maybe a 1.1 or alpha branch?

This PR adds the spec changes to support the proposed/alpha 1.1 spec

• Redirect is added as an optional parameter on transfer request URLs. Note that for transaction requests redirects are part of the POST response which is out of scope for the SDK.
• A new MessageSignRequestURLFields is added with just a link field. Internally encodeURL encodes it in the same way as a transaction request

Notes:

• No SDK changes are made for transaction request error handling, because again they're just part of the POST response
• Should we deprecate the label and message fields of TransactionRequestURLFields? They're not in the spec and I haven't included them in the fields for message signing requests. I think they're superseded by label in the GET response, and message in the POST response. If we eventually remove them we could simplify the encoding since transaction request and message signing request would be the same structure.
• I think using encodeTransactionOrMessageSignRequestURL is kinda hacky, but we can't differentiate TransactionRequestURLFields from MessageSignRequestURLFields at a typescript level

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