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ARROW-12621: [C++][Gandiva] Add alias to sha1 and sha256 functions

The names of the sha functions are **hashSHA1** and **hashSHA256**. The objective is to make the functions also being available through the **sha** and **sha1** names for SHA1 algorithms and **sha2** and **sha256** for SHA256 algorithms.

Closes #10218 from anthonylouisbsb/feature/add-alias-sha-functions and squashes the following commits:

da4f9350e <Anthony Louis> Remove SHA2 alias
559d6caaa <Anthony Louis> Add tests to check if alias are working
a101dd888 <Anthony Louis> Add alias to sha hash functions

Authored-by: Anthony Louis <anthony@simbioseventures.com>
Signed-off-by: Praveen <praveen@dremio.com>