[HUDI-7386] Add Builder to FileGroup Reader

[jonvex]

Change Logs

Number of constructor params is getting too long for the fg reader. Use builder style instead.

Impact

Easier to keep track of params for fg reader

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

low

Documentation Update

N/A

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:

• 7a032b2d72443ead03c3fb39af22552db360a2ba Azure: FAILURE

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