[rust] Support different ways to configure Selenium Manager (config file, envs) (#11810)

* [rust] Support different ways to configure Selenium Manager (config file, envs)

* [rust] Update proxy setup

* [rust] Improve error cases for proxy setup

* [rust] Check values from CLI flags for setting config

* [rust] Support for multiple labels in config keys

* [rust] Support for boolean config keys (debug, trace)

* [rust] Reuse concat function in config module

* [rust] Update Cargo.Bazel.lock

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Co-authored-by: Diego Molina <diemol@users.noreply.github.com>