Support for limit and offset for querie and sequences support inserts

[nenodias]

Example of eloquent
Eloquent used the words skip and take.

To limit the number of results returned from the query, or to skip a given number of results in the query, you may use the skip and take methods:

Sequence fields would be using a method like .setValueBySequence("id", "seq_user")
On postgres the return would nextval('seq_user')
On oracle the return would seq_user.nextval
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