[HUDI-3245] Convert uppercase letters to lowercase in storage configs

[cdmikechen]

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What is the purpose of the pull request

JIRA https://issues.apache.org/jira/browse/HUDI-3245

Spark use CaseInsensitiveMap to get options, so that we can not get some configs in HoodieStorageConfig like hoodie.parquet.writeLegacyFormat.enabled and hoodie.parquet.outputTimestampType
We should convert uppercase letters to lowercase letters, so that it can not affect the related method.

Brief change log

• replace hoodie.parquet.writeLegacyFormat.enabled to hoodie.parquet.writelegacyformat.enabled
• replace hoodie.parquet.outputTimestampType to hoodie.parquet.outputtimestamptype

Verify this pull request

This pull request is already covered by existing tests

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:

• a18347b Azure: SUCCESS

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[cdmikechen]

@nsivabalan
Hi~ This PR may be a required patch for versions 0.10.1 and later. Can you contact the relevant committer/PMC for help, please?
In addition, there is a related commit that also involves related issues, which may also need to be merged into 0.10.1

[nsivabalan]

LGTM. verified locally.