[MINOR] fix get builtin function issue from Hudi catalog

[stayrascal]

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What is the purpose of the pull request

• Fix NPE problem during search Flink builtin function TO_DATE('xxx') while enable Hudi catalog, because the original logic of getPartition(ObjectPath tablePath, CatalogPartitionSpec catalogPartitionSpec) is return null, which will caused NPE problem.

Brief change log

• Replace null with FunctionNotExistException of getFunction method in HoodieCatalog.java
• Replace null with PartitionNotExistException of getPartition method in HoodieCatalog.java
• Add a IT case to test get builtin function
• Change TableSchema to ResolveSchema in ContinousFileSource.java

Verify this pull request

• Added integration tests(testBuiltinFunctionWithCatalog) in HoodieDataSourceITCase.java

Committer checklist

• Has a corresponding JIRA in PR title & commit

• Commit message is descriptive of the change

• CI is green

• Necessary doc changes done or have another open PR

• For large changes, please consider breaking it into sub-tasks under an umbrella JIRA.

[hudi-bot]

CI report:

• 10e080b Azure: SUCCESS

Bot commands

@hudi-bot supports the following commands:

• @hudi-bot run azure re-run the last Azure build

[nsivabalan]

@danny0405 : feel free to ask someone else to review if you are occupied w/ other work items.

[danny0405]

+1