Derive hash on Call

[gaetbout]

For convenience Call should derive Hash

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This change is 

[orizi]

Reviewable status: 0 of 1 files reviewed, 1 unresolved discussion (waiting on @gaetbout)

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corelib/src/starknet/account.cairo line 7 at r1 (raw file):

    to: ContractAddress,
    selector: felt252,
    calldata: Array<felt252>

Hash on array is yet to be implemented (and requires decisions).
This will not work for the time being.

Code quote:

    calldata: Array<felt252>

[gaetbout]

hey @orizi,
lmk if a decision is taken, I wouldn't mind doing it :)