[draft][processor/transform] Create Additional*Funcs config properties to provide additional OTTL funcs programatically.

[franciscovalentecastro]

Description

Adding a new feature as new Config fields called AdditionalLogFuncs, AdditionalSpanFuncs and AdditionalMetricFuncs to programatically (not from a config file) add new OTTL funcs to the resulting transform processor.

Link to tracking issue

• TODO

Testing

• Added unit tests for the modified methods and functions.

Documentation

• TODO

[linux-foundation-easycla]

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