Add `isOneOf` method to `ChiselEnum` (#1966)
* Add @ekiwi's code as a starting point * Add test for ChiselEnum isOneOf method * Make isOneOfTester naming consistent with other testers * Add scaladoc comments for isOneOf * Add isOneOf tests that use the method that takes variable number of args * Add guide level documentation example for isOneOf
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f1e37900