CNDB-15362: Replace SASI by a dummy implementation #2013
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What is the issue
SASI has never been supported, so it's mostly dead code. This would allow us to get rid of code that we are still partially maintaining, spending resources on CI, build, etc.
This has already be done in DSE 6.9: https://github.com/riptano/bdp/commit/358767f8ae21c91b8241bc26e98cf7f922daff8b
What does this PR fix and why was it fixed
This patch replaces SASI internals by a no-op implementation that ignores writes and rejects reads. It's still allowed to create new SASI indexes so old schemas keeps working, for example when restoring a snapshot with SASI. However, they will be no-op with a clear client warning about SASI not being supported nor functional anymore.