Add outputtype module

Summary:
Moves OutputType into its own module

• Move AddAndGetDestinationForScript from wallet to outputype module

Makes AddAndGetDestinationForScript use a generic CKeyStore rather than
the wallet, and makes it always add the script to the keystore, rather
than only adding related (redeem) scripts.

• segwit support for createmultisig RPC
• [tests] functional test for createmultisig RPC

This is a backport of Core PR13072

Depends on D4423

Test Plan:

make check
./test/functional/test_runner.py

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D4424