[Soft bundle] enable soft bundle byte size checks on API

[akichidis]

Description

Following the work on https://github.com/MystenLabs/sui/pull/20325 , this PR is essential to ensure that submitted soft bundle transactions will make it through consensus and won't be rejected due to excessive size (for the edge cases). Now the API will return a SoftBundleTooLarge error if the soft bundle in size bytes is > consensus_block_size/2 .

Test plan

CI

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Release notes

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• [ ] Protocol:
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• [ ] Indexer:
• [ ] JSON-RPC:
• [ ] GraphQL:
• [ ] CLI:
• [ ] Rust SDK:
• [ ] REST API:

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