Add --derives_for_type to cli

[fmiguelgarcia]

Description

Add --derive_for_type to the cli

Example

subxt codegen \
   --derive Clone \
   --derive PartialEq \
   --derive Eq \
   --derive_for_type my_module::my_type_1=serde::Serialize \
   --derive_for_type my_module::my_type_1=serde::Deserialize \
   --derive_for_type my_module::my_type_1=Default \
   --url http://localhost:9933 \
   | rustfmt --edition=2021 --emit=stdout > api.rs

[cla-bot-2021]

User @migroslinx, please sign the CLA here.

[mordamax]

@fmiguelgarcia @migroslinx as discussed in matrix - in order that CLA signature works - the committer and the signer should be the same account. Currently seems like you committed under @migroslinx, but trying to sign with @fmiguelgarcia

Either sign as @migroslinx or re-create a commit under @fmiguelgarcia

[jsdw]

Nit; can we go with derive-for-type please (ie dashes instead of underscores) :)

[fmiguelgarcia]

Superseded by PR 708