[MINOR] Add backward compatibility test for HoodieTableConfig partition field APIs

[lokeshj1703]

Change Logs

Adds a test to ensure the backward compatibility is maintained for the partiton field APIs. Partition fields in table config now store the partition field type as well which are useful for CustomKeyGenerator.

Impact

NA

Risk level (write none, low medium or high below)

low

Documentation Update

NA

Contributor's checklist

• [ ] Read through contributor's guide
• [ ] Change Logs and Impact were stated clearly
• [ ] Adequate tests were added if applicable
• [ ] CI passed

[hudi-bot]

CI report:

• 0640fa3d9bbadd79cf4d3bc025f35cf679bf7280 Azure: SUCCESS

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