[HUDI-7641] Adding metadata enablement metrics and index type metrics

[nsivabalan]

Change Logs

Adding metrics to track mdt partitions enabled.

Impact

Easier for feature rollout when enabling new partitions in MDT.

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

low

Documentation Update

Describe any necessary documentation update if there is any new feature, config, or user-facing change. If not, put "none".

• The config description must be updated if new configs are added or the default value of the configs are changed
• Any new feature or user-facing change requires updating the Hudi website. Please create a Jira ticket, attach the ticket number here and follow the instruction to make changes to the website.

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:

• 59d53ba7cc510038dcaea707f434ebc5529b29dc UNKNOWN
• ab39be7b9f1d7bf9de4b69640dce50105b6d9147 Azure: SUCCESS

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