add support for sai debug generate dump

[aviramd]

This update adds support for the sai_dbg_gen_dump API, enabling the generation of a debug dump file by the SAI when there is no SAI failure. For scenarios involving SAI failures, a separate flow called dump_on_sai_failure is available.

Currently, this API is only invoked in the vendor specific use case to avoid disrupting existing implementations for other vendors.

An auxiliary script "gen_sai_dbg_dump.sh" is also provided to generate the dump file directly without requiring the show techsupport command.

An HLD will be publish soon with all relevant PRs

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Previous command output (if the output of a command-line utility has changed)

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