refactor: remove clio dependency to fix compilation issues

[sasa-tomic]

Eliminate the clio dependency and update the handling of private_key_pem in AuthOpts to use a String instead of InputPath. This change simplifies the code and improves the management of private key paths.

error[E0599]: the method `value_parser` exists for reference `&&&&&&_infer_ValueParser_for<InputPath>`, but its trait bounds were not satisfied
    --> rs/cli/src/commands/mod.rs:99:5
     |
99   |     /// Path to private key file (in PEM format)
     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ method cannot be called on `&&&&&&_infer_ValueParser_for<InputPath>` due to unsatisfied trait bounds
     |
    ::: /home/sat/.cargo/registry/src/index.crates.io-6f17d22bba15001f/clap_builder-4.5.20/src/builder/value_parser.rs:2423:1
     |
2423 | pub struct _infer_ValueParser_for<T>(std::marker::PhantomData<T>);
     | ------------------------------------ doesn't satisfy `_: _impls_FromStr`
     |
    ::: /home/sat/.cargo/registry/src/index.crates.io-6f17d22bba15001f/clio-0.3.5/src/input.rs:374:1
     |
374  | pub struct InputPath {
     | -------------------- doesn't satisfy 7 bounds
     |
     = note: the following trait bounds were not satisfied:
             `clio::InputPath: clap::ValueEnum`
             which is required by `&&&&&clap::builder::_infer_ValueParser_for<clio::InputPath>: clap::builder::impl_prelude::_impls_ValueEnum`
             `clio::InputPath: clap::builder::ValueParserFactory`
             which is required by `&&&&&&clap::builder::_infer_ValueParser_for<clio::InputPath>: clap::builder::impl_prelude::_impls_ValueParserFactory`
             `clio::InputPath: std::convert::From<std::ffi::OsString>`
             which is required by `&&&&clap::builder::_infer_ValueParser_for<clio::InputPath>: clap::builder::impl_prelude::_impls_From_OsString`
             `clio::InputPath: std::convert::From<&'s std::ffi::OsStr>`
             which is required by `&&&clap::builder::_infer_ValueParser_for<clio::InputPath>: clap::builder::impl_prelude::_impls_From_OsStr`
             `clio::InputPath: std::convert::From<std::string::String>`
             which is required by `&&clap::builder::_infer_ValueParser_for<clio::InputPath>: clap::builder::impl_prelude::_impls_From_String`
             `clio::InputPath: std::convert::From<&'s str>`
             which is required by `&clap::builder::_infer_ValueParser_for<clio::InputPath>: clap::builder::impl_prelude::_impls_From_str`
             `clio::InputPath: std::str::FromStr`
             which is required by `clap::builder::_infer_ValueParser_for<clio::InputPath>: clap::builder::impl_prelude::_impls_FromStr`
     = note: this error originates in the macro `clap::value_parser` (in Nightly builds, run with -Z macro-backtrace for more info)

For more information about this error, try `rustc --explain E0599`.
error: could not compile `dre` (lib test) due to 2 previous errors
warning: build failed, waiting for other jobs to finish...
error: could not compile `dre` (lib) due to 2 previous errors