feat: Add SHA256 encryption method

[ben-schulz-mh]

Feature scope

Inline mapping (stream maps, flattening, etc.)

Description

Currently only MD5 is supported. SHA256 is a more secure encryption method that is used widely and is desired. For context, another ETL provider (Fivetran) use SHA256 and this would allow feature parity with that solution.

[edgarrmondragon]

PRs welcome @ben-schulz-mh!

EDIT: if someone wants to contribute this, the places to look at are:

sdk/singer_sdk/mapper.py

Lines 54 to 63 in 920d630

	def md5(string: str) -> str:
	"""Digest a string using MD5. This is a function for inline calculations.
	Args:
	string: String to digest.
	Returns:
	A string digested into MD5.
	"""
	return hashlib.md5(string.encode("utf-8")).hexdigest() # noqa: S324

sdk/singer_sdk/mapper.py

Lines 309 to 312 in 920d630

	funcs["md5"] = md5
	funcs["datetime"] = datetime
	funcs["bool"] = bool
	funcs["json"] = json