[core] Support append read/write for MAP shared-shredding#8524
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Purpose
This is a subtask of MAP shared-shredding support.
Add append table read/write support for MAP shared-shredding.
This wires MAP shared-shredding into the append write path and ORC/Parquet read path, keeps the format layer working with physical read rows, and converts them back to logical MAP rows through the shredding read plan. It also adds end-to-end coverage for basic read/write, multiple shared-shredding MAP fields, projection, data evolution, metadata recovery, null values, overflow values, and complex value types.
This PR may look somewhat large at first glance, but more than 1600 lines are tests, and the amount of production code added is relatively limited.
Tests
mvn -pl paimon-common,paimon-core -am -Pfast-build -DfailIfNoTests=false -DwildcardSuites=none -Dtest=MapSharedShreddingReadPlanTest,AppendOnlyWriterTest testmvn -pl paimon-core -am -Pfast-build -DfailIfNoTests=false -DwildcardSuites=none -Dtest=MapSharedShreddingTableTest testmvn -pl paimon-common,paimon-core -am -DskipTests spotless:applygit diff --check