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ARROW-12443: [C++][Gandiva] Implement castVARCHAR function for varbinary input

Implement castVARCHAR function for varbinary input

Closes #10095 from jpedroantunes/feature/add-cast-varchar-varbinary and squashes the following commits:

bab024601 <João Pedro> Improve castvarchar for binary macro name
395595393 <João Pedro> Remove unused empty line on string ops
830aabe90 <João Pedro> Fix linter errors on string ops files
ef918af60 <João Pedro> Fix linter errors on string ops files
82fa58fe8 <João Pedro> Fix wrong function name defined on native function
a129dff02 <João Pedro> Add implementation for castvarchar for binary values, using the same one as the function for varchar inputs
72ec38b02 <João Pedro> Add base logic for the castvarchar for binary inputs

Authored-by: João Pedro <joaop@simbioseventures.com>
Signed-off-by: Praveen <praveen@dremio.com>