[Feature] Default microbatch strategy implementation + testing in dbt-adapters

[MichelleArk]

As part of dbt-labs/dbt-core#10624, we will need the new microbatch incremental strategy to be considered a 'builtin' incremental strategy, where its default macro implementation should simply raise a not implemented error.

Additionally, a base test should be written that adapter implementations can inherent and override as necessary.

[MichelleArk]

closed by #300