Feat/3362 - add oracle testing setup

[ivasio]

Changes in the testing setup

• Added oracle, now oracle source tests can be added. Very basic set of tests is currently there, to be improved in other PRs
• There's now 3 groups of "local source" tests running in a matrix in CI: those that use oracle, mssql or postgres/other sources. When adding new tests for the first 2 categories, mssql and oracle pytest marks should be used, e.g. like here

Oracle - current changes and plans

• Currently, we're claiming we don't fully support oracledb driver in thin mode. The direction me and @rudolfix have chosen is to actually support it as much as we can and test/document the caveats. The older cx_Oracle has been deprecated for 3 years now in favour of oracledb, so we don't want to promote it's usage and don't test it
• In this PR, an oracle extra has been added which installs only the oracledb driver. In fact, it's only usable with sqlalchemy>2, but I couldn't add this requirement to avoid the conflict with requirement groups defined in pyproject.toml
• Documentation etc. to be added in separate PRs. This one is aimed to unlock the other ones in terms of testing setup

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