docs: add omise fields in events and settings schema

[uds5501]

Fixes #5864

Changes proposed in this pull request:

• add omise fields in events and settings schema descriptions
• update response and requests accordingly in the docs

[codecov]

Codecov Report

Merging #5979 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #5979   +/-   ##
============================================
  Coverage        66.45%   66.45%           
============================================
  Files              284      284           
  Lines            13902    13902           
============================================
  Hits              9239     9239           
  Misses            4663     4663

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[uds5501]

@mrsaicharan1 @iamareebjamal please review?

[shreyanshdwivedi]

LGTM 👍