Port the Zowe Secrets SDK to Python

[t1m0thyj]

Historically the node-keytar package has been used by Zowe CLI and Explorer to store secure credentials.
After that package was deprecated at end of 2022, Zowe CLI squad created the Secrets SDK as a replacement.

Currently we use the Python keyring package which has a number of quirks.
On Windows, it doesn't always use the same encoding as node-keytar:

zowe-client-python-sdk/src/core/zowe/core_for_zowe_sdk/credential_manager.py

Lines 100 to 105 in 58178c0

	if is_win32:
	try:
	encoded_credential = encoded_credential.encode('utf-16le').decode()
	except (UnicodeDecodeError, AttributeError):
	# The credential is not encoded in UTF-16
	pass

On Linux, it requires a custom backend to read from the correct keyring. Currently our custom backend only implements get_password, so on some Linux systems set_password and delete_password may fail.

zowe-client-python-sdk/src/core/zowe/core_for_zowe_sdk/zosmf_profile.py

Line 132 in 558edfb

class KeyringBackend(SecretService.Keyring):

In the future, maybe we can investigate publishing the Rust keyring backend used by the Secrets SDK as a crate:
https://github.com/zowe/zowe-cli/tree/master/packages/secrets/src/keyring
Then we could create Python bindings for the Rust keyring, and publish a Secrets SDK for Python like the one for Node.js 😋

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