Group record merging configs into a single java object

[hudi-bot]

merge mode

merge strategy 

payload class

maybe merge impls should be grouped into a java object because they will be used together pretty much every time

JIRA info

• Link: https://issues.apache.org/jira/browse/HUDI-8407
• Type: Improvement
• Epic: https://issues.apache.org/jira/browse/HUDI-6243
• Fix version(s):
  • 1.1.0