Use call_index attribute to fix warning and CI step build-all-benchmarks-packages

[RustNinja]

• use #[pallet::call_index(0)] for each callable function in pallet
• it is by recommendation:

 Please ensure that all calls have the `pallet::call_index` attribute or that the
                     `dev-mode` of the pallet is enabled. For more info see:
                     <https://github.com/paritytech/substrate/pull/12891> and
                     <https://github.com/paritytech/substrate/pull/11381>.

• it will fix CI step build-all-benchmarks-packages