Variable FUNCTION_ID_PATTERN`Const`

FUNCTION_ID_PATTERN: "^[a-zA-Z0-9]+$" = '^[a-zA-Z0-9]+$'

Pattern for a Contentful Function's id.

Structurally identical to ACTION_ID_PATTERN today, but kept as its own export because a Function id and an App Action id are distinct concepts that may diverge independently.