Remove call index from the cross-chain interface

[yrong]

Resolves: https://linear.app/snowfork/issue/SNO-657

Requires: Snowfork/cumulus#66

[codecov]

Codecov Report

Attention: 39 lines in your changes are missing coverage. Please review.

Comparison is base (f6a0e86) 77.12% compared to head (194c7dd) 76.42%.

❗ Current head 194c7dd differs from pull request most recent head 6d37669. Consider uploading reports for the commit 6d37669 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #961      +/-   ##
==========================================
- Coverage   77.12%   76.42%   -0.71%     
==========================================
  Files          44       45       +1     
  Lines        1836     1879      +43     
  Branches       72       76       +4     
==========================================
+ Hits         1416     1436      +20     
- Misses        401      424      +23     
  Partials       19       19              

Flag	Coverage Δ
rust	77.56% <56.66%> (-0.08%)	⬇️
solidity	71.58% <100.00%> (-3.11%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
contracts/src/Assets.sol	67.85% <100.00%> (ø)
contracts/src/Gateway.sol	78.37% <100.00%> (-2.43%)	⬇️
parachain/pallets/control/src/lib.rs	98.94% <ø> (ø)
parachain/pallets/inbound-queue/src/lib.rs	65.90% <100.00%> (+0.79%)	⬆️
parachain/primitives/core/src/outbound.rs	30.48% <ø> (ø)
parachain/primitives/router/src/inbound/mod.rs	58.41% <55.68%> (-0.10%)	⬇️

... and 1 file with indirect coverage changes

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[vgeddes]

Lets merge this in 🚀