Creating indexes in the indexes section of a model config

[semcha]

Implementation of #163

• clustered / nonclustered indexes
• row-store (b-tree) / columnstore indexes
• uniqueness (UNIQUE) for row-store indexes (clustered and nonclustered)
• nonclustered row-store index may have included columns: INCLUDE (col1, col2)
• data compression: ROW / PAGE compression for row-store and COLUMNSTORE / COLUMNSTORE_ARCHIVE for columnstore
• partitioning (partition schema name and partition column)

[semcha]

Hi @swanderz! It takes 4-5 days to test, but I'm ready to accept suggestions/edits 🚀

[NicolasPA]

Am I correct to think that this PR introduces the possibility to create a unique non-clustered index, which wasn't possible before?

This would be very useful for us!

[semcha]

@NicolasPA Yep, of course:

indexes=[
    {'type': 'nonclustered', 'columns': ['customer_id'], 'unique': True}
]

[sdebruyn]

Should be rebased on latest master