[CH]add a profile for mergetree build

### Description

Currently MergeTree reader/writer for CH backend depends on delta jars. When no delta jars exists in spark jars directory, it will fail even not use MergeTree related feature. Add an option to allow build CH backend without MergeTree, so no delta jars will be needed.
An example to build without MergeTree:
mvn -DskipTests=true -P backends-clickhouse,hadoop-3.3,spark-3.3,spark-ut,-mergetree clean install

Start by running the example Maven command and inspect the build profiles for backends-clickhouse and mergetree. Trace how the MergeTree profile affects the ClickHouse backend build and verify that disabling it allows a successful build without Delta jars while leaving MergeTree-related features disabled.

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