feat!: Add ALTER TABLE SET

[VaggelisD]

Introduce support for ALTER TABLE ... SET ... across first class dialects.

Design notes:

• Create an exp.AlterSet node belonging in ALTER_PARSERS that will hold the arguments across all mentioned dialects
• Create exp.DataDeletionProperty to parse T-SQL's DATA_DELETION argument
• Modify exp.WithSystemVersioningProperty and exp.SerdeProperties to optionally include the WITH keyword as a boolean arg
• Utilize parse_properties as a catch-all since many options are parsed as such already & to parse simple statements like ALTER TABLE ... SET <opt> = <val> as "anonymous" exp.Property which solves the need of more manual parsing

Docs

T-SQL | Postgres | Spark | Hive | Databricks | Snowflake | Redshift | BigQuery

[georgesittas]

Great work @VaggelisD 👍

[georgesittas]

Ok couple more comments, LGTM otherwise