Microbatch Strategy

[MichelleArk]

resolves #1109
docs dbt-labs/docs.getdbt.com/#

Problem

As part of dbt-labs/dbt-core#10624, dbt-spark needs to implement a microbatch incremental strategy.

Solution

• In spark, this will use the insert_overwrite strategy and explicitly require a partition_by field.
• testing against same profiles as insert_overwrite testing
• testing against parquet, since it supports timestamp partitioning

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX

[github-actions]

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