Update Oracle driver to have the `ssl` (boolean) option, with the expectation that any keystore/truststore params have been set as JVM parameters

Updating CircleCI config to allow for the following parameters to the `test-driver` orb:
- `extra-env`: a string that will be prepended to the `lein test` invocation, in order to set environment variables specifically for that test run.  Expected to look like `VAR_NAME=a VAR_NAME_2=b`. Defaults to blank (i.e. nothing).
- `test-selector`: a string that represents the Leiningen test [selectors](https://cljdoc.org/d/leiningen/leiningen/2.9.5/api/leiningen.test#test). Defaults to `:all` (i.e., run all tests).

Adding RDS root CA truststore file to our resources so that CircleCI (and anyone else, really) can refer to it

Defining new `be-tests-oracle-ssl-ee test-driver` task, and is identical to it except for the env vars required to connect via SSL instead (by specifying the RDS root CA trust store).  It only runs a few Oracle driver specific tests, not the full suite, since we are really only concerned with connectivity here.

Updating Oracle driver docs to discuss relevant JVM params and configuration