Command dedup conformance suites readme (#11051)

* Add readme which explains the differences between different command deduplication suites

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* Update readme

ledger/ledger-api-test-tool/README.md

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+### Command deduplication test suites
+
+As different ledgers have different support for command deduplication, we provide multiple test suites which try to be as comprehensive as possible for all the various ledgers
+
+* default - is it a default test suite which does not need to be included explicitly
+* append-only - Requires the schema to be append-only because we use the submission id set in the completion, which is
+  present only for append-only schemas
+* configuration-required - If it requires specific settings to be set for the ledger configuration
+
+| Name | Default | Append only | Configuration required | Details |
+| --- | --- | --- | --- | --- |
+|CommandDeduplicationIT|Yes|No| No  |Tests participant deduplication|
+|KVCommandDeduplicationIT| No | No | minSkew set to 1 second. maxDeduplicationDuration has to be < 5s | Extends the test cases from `CommandDeduplicationIT` with committer side test cases. Requires the time model update because KV committer deduplication is based on maxDeduplicationDuration + minSkew|
+|AppendOnlyKVCommandDeduplicationIT|No|Yes|Same as KVCommandDeduplicationIT | Same as `KVCommandDeduplicationIT` but it requires an append-only schema so that we have access to the submission id|
+|AppendOnlyCommandDeduplicationParallelIT | No |Yes| No | Requires append only schema so that we have access to the submission id. |