Support insert/update/delete statements for batch operations

[thomaslevesque]

As a pseudo-SQL language, parsed and translated to :

• document creation for insert statements
• query-then-update for update statements
• query-then-delete for delete operations

e.g.:

insert into c { name: 'foo', price: 123.0 }

update c set c.answer = 42 where c.question = 'life, the universe and everything'

delete c where c.expirationDate < '2019-01-01T00:00:00'

(exact syntax tbd)

Request options should be supported, as specified in #2 (e.g. partition key, pre/post triggers...)

Bonus: optionally, create a temporary stored procedure to perform the operations atomically in a transaction (would fail if execution exceeds the provisioned throughput, e.g. if too many documents are affected)