Add the buffered inference manager (#4954)

This class implements a highly common pattern of buffering facts and lemmas to send on the output channel. It is planned that the inference managers of strings, sets, datatypes, (non-linear) arithmetic, sep, quantifiers will inherit from this class.

This PR adds basic calls to add lemmas on the output channel from InferenceManager.

It introduces a Lemma virtual class which arith::nl::NlLemma and strings::InferInfo will inherit from.

This is required to begin refactoring a flexible configurable strategy for non-linear arithmetic, and will make it easier to further develop towards a configurable approach for theory combination.

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