feat: add L1->L2 hashes

[PhilippeR26]

Motivation and Resolution

Solves issue #1178
Provides functions to calculate L1->L2 hashes.
L2->L1 hash has already been implemented in PR #702

Usage related changes

2 new functions :

• L1->L2 message Hash :

const l1L2MessageHash = hash.getL2MessageHash(l1FromAddress, l2ToAddress, l2Selector, payload, l1Nonce);

• L1->L2 transaction Hash :

const l1L2txH = hash.calculateL2MessageTxHash(l1FromAddress, l2ToAddress, l2Selector, payload, constants.StarknetChainId.SN_SEPOLIA, l1Nonce);

All inputs have to be recovered from a L1 explorer.

Development related changes

• Some code from PR Add provider function to get L1 message hash (where applicable) #702 is also valid for this PR. So this code has been refactored in hash.solidityUint256PackedKeccak256()
• hash.getSelector() has been improved to accept also as input the type BigNumberish.
  All messaging functions have been added in the guides.

Checklist:

• Performed a self-review of the code
• Rebased to the last commit of the target branch (or merged it into my branch)
• Linked the issues which this PR resolves
• Documented the changes in code (API docs will be generated automatically)
• Updated the tests
• All tests are passing

[tabaktoni]

LGTM !

[github-actions]

🎉 This issue has been resolved in version 6.12.0 🎉

The release is available on:

• npm package (@next dist-tag)
• GitHub release

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