[HUDI-8746] Introduce SparkFileReader for general base file format

[linliu-code]

Change Logs

This PR

1. introduces SparkFileReader that could be extended to readers for different base file formats.
2. passes a map of [HoodieFileFormat, SparkFileReader] into Spark ReaderContext for FG reader.

Impact

Lays the foundation for future support of HFile reader in Spark.

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:

• 88d27e0e5d22e1708e5974b86a9a32caf9990c94 Azure: FAILURE

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