Add visible warnings for incompatible options in `%%opencypher`

[michaelnchin]

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Is your feature request related to a problem? Please describe.

The %%opencypher magic currently accepts two arguments specific to Neptune Analytics databases:

• --plan-cache/-pc
• --query-timeout/-qt

However, when connected to Neptune DB, %%opencypher accepts these parameters without throwing a user-visible exception. Internally, their values are simply discarded prior to generation of the final request. This may cause confusion for Neptune DB users expecting modified query behavior.