Add random forest classifier for tomographer

[hangqianjun]

Change Description

• [x] My PR includes a link to the issue that I am addressing #2

Solution Description

Moved random forest classifier for the tomographer class from rail_base to rail_sklearn due to its dependence on sklearn.

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[hangqianjun]

Unit tests pass on local machine but not on GitHub. Waiting for new release of rail to include classifier class.