Adding a draft of specific types for Rialto & Millau chains (#706)

* Adding a draft of specific types for Rialto & Millau chains

* Updating types definitions and removing old types.json

* Renaming file name as requested

* fixing typos on millau.json

* Adding Fee,SpecVersion and correct OutboundMessageFee

* Adding Fee,SpecVersion and correct OutboundMessageFee

* Addressing PR feedback

* removing MultiSignature object as agreed

* Mapping Fee type with Balance * fixed

* Mapping Fee type with Balance * fixed

* Extra common types.

* Extra shared types and add a builder script.

* Don't use OpaqueCall

* Add other missing types for block explorer to work.

* Fix missing types.

* Add ancestry proof type.

* Fix typo.

* Fix typo

Co-authored-by: Tomasz Drwięga <[email protected]>
Co-authored-by: Hernando Castano <[email protected]>