Raise statements in session.py do not specify an exception type derived from BaseException

[adam-wolfe]

Describe the bug

If a user fails to specify a host, user && password, tokenType && tokenValue, or tokenValue in their connection object when creating a session, the user will be presented with:

Exception has occurred: TypeError
exceptions must derive from BaseException

From src/core/zowe/core_for_zowe_sdk/session.py, the lines to be revised are (line numbers may change):
Line 48: raise "Host must be supplied"
Line 64: raise "An authentication method must be supplied"

Describe your environment

Additional context

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