Add support for the new view Michelson sections in the michel-codec package

[roxaneletourneau]

The Hangzhou protocol brings a new section to the Michelson script called view.

Views are declared at the top level of the script of the contract on which they operate, alongside the contract parameter type, storage type, and code.
Example:

{ parameter nat;
  storage nat;
  code { CAR; NIL operation ; PAIR };
  view "add_v" nat nat { UNPAIR; ADD };
  view "mul_v" nat nat { UNPAIR; MUL };
}

Acceptance criteria:

• Add support for the new view Michelon section: https://github.com/ecadlabs/taquito/blob/master/packages/taquito-michel-codec/src/michelson-types.ts#L165
• Support conversion between Micheline and Michelson when views are present in a contract script.

Additional context
https://github.com/ecadlabs/taquito/blob/master/packages/taquito-michel-codec/src/michelson-types.ts#L165