Add bigint attr

[vaishnavyogesh]

Related to #1498

Add in optional bignumeric attribute which converts sql bigints to php ints and sql decimal and numeric to php float

Add basic tests for string vs int/float returns

continuing (checked out) from:
PR: #1500
Repo: https://github.com/startork/msphpsql/tree/add_bigint_attr

[vaishnavyogesh]

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