Implement Firebird XA transaction support

[makssent]

Changes proposed in this pull request:

• Added FirebirdXADataSourceDefinition
• Added FirebirdXAConnectionWrapper

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[makssent]

/* TODO: Fix the error with getting XAResource
assertThat(actual.getXAResource(), */

An issue was discovered in the current code when trying to retrieve the XAResource object via the actual.getXAResource() call. The problem is related to the fact that during the creation of the FBXAConnection object, the connection reference (connection) is not properly stored in the mc variable (which is supposed to hold a weak reference to the FBConnection).

I described the problem to provide an understanding of the solution, in case I return to fix it, or perhaps some enthusiastic person will take it on

[terrymanu]

Great!