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ARROW-9956: [C++] [Gandiva] Implementation of binary_string function in gandiva

Function takes in a normal string or a hexadecimal encoded string( Eg: \xca\xfe\xba\xbe) and converts it to VARBINARY (byte array).

Closes #8201 from naman1996/ARROW-9956 and squashes the following commits:

f3abfd627 <naman1996> Force inlining helper function
cf335be68 <naman1996> Removing convert_fromUTF8_binary
746f993a5 <naman1996> removing include of arrow/util/string.h
af6e12e36 <naman1996> Changes to remove parseHexValue
5d1c90a10 <naman1996> Correcting typo
f970214a3 <naman1996> Removing error thrown by ParseHexValue for parity with java implementation
11572ceb4 <naman1996> setting out_len to 0
90a7798f1 <naman1996> Making char array null terminated for failing unit test in ubuntu
af3785a1d <naman1996> Fixing small linting error
4d09d154e <naman1996> Changes to remove std::string
d3afcb91a <naman1996> refactor to use arrow::ParseHexValue
8b4f563cd <naman1996> fixing test
dec947544 <naman1996> fixing test issue
52a1708de <naman1996> fixing lint errors
562b285c2 <naman1996> correcting linting errors
1f7fb91eb <naman1996> handling null string case
58efbb93c <naman1996> adding binary string function

Authored-by: naman1996 <namanudasi160196@gmail.com–>
Signed-off-by: Praveen <praveen@dremio.com>