feat: minimum extension configuration to Ferret

There may be cases where Ferret is instantiated but the number of COTs which end up being needed do not justify the overhead of bootstrapping Ferret and can be done more efficiently using the underlying COT protocol (e.g. KOS).

Add a configuration option to Ferret which sets a threshold for when Ferret gets bootstrapped. A reasonable default for this can be determined empirically.

Read the Ferret implementation and its bootstrap flow, then trace how the underlying COT protocol (such as KOS) is used when Ferret is not bootstrapped. Determine an empirically reasonable threshold and add it as a configuration option; the work is done when the threshold controls whether bootstrapping occurs. The issue names no files or tests.

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