Add OracleDB support to golang-migrate

[JailtonJunior94]

Add OracleDB support to golang-migrate
This PR implements support for OracleDB in golang-migrate. The main changes include:

• Addition of the OracleDB driver in oracle.
• Implementation of necessary functions for migrations, including Open, Close, Lock, Unlock, Run, SetVersion, Version, and Drop.
• Addition of tests for the OracleDB driver in oracle_test.go.
• Update of the documentation in README.md to include instructions on how to use the OracleDB driver.

How to Test:

1. Set up an OracleDB environment.
2. Run the unit and integration tests to ensure all functionalities are working correctly.
3. Follow the instructions in the documentation to test real migrations using the OracleDB driver.

[coveralls]

coverage: 57.043% (+0.7%) from 56.319%
when pulling a601110 on JailtonJunior94:oracle
into d477553 on golang-migrate:master.

[mauri870]

I'm not familiar with OracleDB, but is it possible to use an official Docker image? Most of the other database tests use official images.

[CesaragsUC]

Good one, waiting to be approved.

[gandarez]

follow up on this

[mczudowski]

@dhui what needs to be done to make this happen? This feature has a lot of interest, it would surely make many people happy.

My team is currently working on a project where Oracle Database is meant to store critical data. We chose to run Flyway in an init container (in Kubernetes environment). While it sure works, it makes lots of things way more complicated.

Is there any way that we can help with this PR?