hyperledger-labs / fabric-smart-client / 23502194192

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fabricx: support multi endorser transaction (#1190)

* fabricx: support multi-endorser transaction assembly

Merge namespace endorsements coming from multiple proposal responses when building the final FSC envelope.

- add endorsement merge logic for proposal responses
- validate that all responses carry the same tx payload
- deduplicate endorsements while preserving per-namespace grouping
- keep single response endorsement verification unchanged
- add unit tests for merge, deduplication, and mismatch cases
- add new integration test coverage for multi endorser flows

Signed-off-by: Said Altury <Said.Altury@ibm.com>

* derive namespace approver from lifecycle policy

Signed-off-by: Said Altury <Said.Altury@ibm.com>

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Signed-off-by: Said Altury <Said.Altury@ibm.com>

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