Handle change streams #69
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Does not cope with changing change streams while underlying columns are dropped.
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Adds handline for diffing Change Streams:
Creates new change streams, drops removed change streams, and alters the
FORandOPTIONSclauses for existing change streams.One caveat: If a change stream references a column that is being dropped (or a table that is being dropped), then the generated difference DDL will fail to apply.
Workaround - perform the change in 2 steps: alter the change stream, then drop the colums/tables
Fixes #9