[Improve][Connector-V2][HBase] Support DATE/TIME/TIMESTAMP/DECIMAL in sink and fix DECIMAL deserialization

[yzeng1618]

Purpose of this pull request

During hive2hbase synchronization, if the upstream table contains DECIMAL/DATE/TIME/TIMESTAMP fields, the HBase sink fails at write time with HbaseConnectorException(COMMON-07 UNSUPPORTED_DATA_TYPE). A short-term workaround is to use transform/cast (e.g., cast DECIMAL/DATE/TIMESTAMP to STRING or BIGINT).

However, from a consistency perspective, the read side (HBaseDeserializationFormat) already attempts to support DATE/TIME/TIMESTAMP/DECIMAL (and the previous DECIMAL-as-float behavior was also unreasonable), while the write side does not, creating an obvious read/write asymmetry. Therefore, this PR completes sink-side support and unifies read/write encoding rules to provide a consistent “semantic closure” within the connector and make common hive2hbase scenarios more out-of-the-box.

Does this PR introduce any user-facing change?

• Adds DECIMAL/DATE/TIME/TIMESTAMP/BYTES support to HBase sink serialization with consistent encoding rules (string bytes for precision/safety).

• Fixes DECIMAL deserialization to parse BigDecimal from string first, with a backward-compatible float fallback for legacy data.

• Adds unit and e2e coverage for these types.

How was this patch tested?

• Unit: HbaseSinkWriterTypeConvertTest.java

• E2E: fake-to-hbase-with-date-time-decimal.conf + hbase-to-assert-with-date-time-decimal.conf and IT method testHbaseSinkWithDateTimeDecimal

Check list

• If any new Jar binary package adding in your PR, please add License Notice according
  New License Guide
• If necessary, please update the documentation to describe the new feature. https://github.com/apache/seatunnel/tree/dev/docs
• If necessary, please update incompatible-changes.md to describe the incompatibility caused by this PR.
• [ * ] If you are contributing the connector code, please check that the following files are updated:
  1. Update plugin-mapping.properties and add new connector information in it
  2. Update the pom file of seatunnel-dist
  3. Add ci label in label-scope-conf
  4. Add e2e testcase in seatunnel-e2e
  5. Update connector plugin_config

[zhangshenghang]

How about updating the relevant documentation?