Context Parameters Refactor

[christopherngutierrez]

Proposed changes

• Updates context parameters
• Removes rns_delta
• New format for context: CONTEXT BGV 16384 <key_rns> <current_rns>
• Example: CONTEXT BGV 16384 3 2

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update (if none of the other choices apply)

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[faberga]

Closing this PR as the code still needs more work.