[HUDI-5293][WIP] Fixing reader schema w/ Merge handle helper w/ schema on read enable + reconcile schema

[nsivabalan]

Change Logs

Commit1:
schema.on.read enable

commit2:
schema.on.read.enable
reconcile.schema

commit 2 fails w/

java.lang.IllegalArgumentException: cannot modify hudi meta col: _hoodie_commit_time
	at org.apache.hudi.internal.schema.action.TableChange$BaseColumnChange.checkColModifyIsLegal(TableChange.java:157)
	at org.apache.hudi.internal.schema.action.TableChanges$ColumnAddChange.addColumns(TableChanges.java:314)
	at org.apache.hudi.internal.schema.utils.AvroSchemaEvolutionUtils.lambda$reconcileSchema$5(AvroSchemaEvolutionUtils.java:92)

Impact

Describe any public API or user-facing feature change or any performance impact.

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

If medium or high, explain what verification was done to mitigate the risks.

Documentation Update

Describe any necessary documentation update if there is any new feature, config, or user-facing change

• 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:

• 8290201 Azure: FAILURE

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