Add support for key_patterns parameter of convert_entry_type

[tkykenmt]

Is your feature request related to a problem? Please describe.
convert_entry_type provides a capability to convert key format. Currently, the processor requires to exact-match key name on key or keys entry. Using regex based key patterns with type check operator [1] will offer flexible converting type capability as follows

• key_patterns: version
• type: integer
• convert_when: /version/typeof float

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