Feat/7683/batch filler repayment

[kss-t1]

Description

Batch repayments for the 7683 intent fillers to optimize their gas costs.

• allows to process Proofs of Read in a batch
• when processing a batch of 7683 repayments, does some smart tricks to minimalise number of _transferTokenOut calls

Also introduces generic batch proof verification to xChainRead.

Functionality of processing a PoRs one by one was unchanged.

Motivation and Context

We want to beat bridging prices of our competition, so we want to show best profitability for solvers. Hence the gas optimization.

How Has This Been Tested?

Unit test which confirms correctness and gas savings. In the unit test, a simple Merkle Trie implementation was used to create Merkle Trie.

Types of changes (remove all unchecked types)

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Style (style only changes)
• Docs
• Refactor (code that does not add new functionality nor fixes a bug)

Checklist:

• If my change requires a change to the documentation, I have updated the documentation accordingly, and in either case, have checked this box to attest to my assessment of this requirement with regard to my change.
• If my change requires additions or updates to any deployment scripts to ensure that the protocol is functional (Makefile, Dockerfile, Forge Script, etc.), I have made these changes, and in either case, have checked this box to attest to my assessment of this requirement with regard to my change.
• If my change requires additional test coverage, I have created those tests accordingly, and in either case, have checked this box to attest to my assessment of this requirement with regard to my change.

[evchip]

@kss-t1 forge fmt please

[evchip]

Not tested.

y no u unit test?

[evchip]

Found a few issues on first pass.