Allow for use of openssl instead of aws-lc-rs

[scasagrande]

Is your feature request related to a problem? Please describe.
I prefer for all of my software to use my local copy of openssl, which is already FIPS compliant, instead of having to build and manage aws-lc-rs / aws-lc-sys

Describe the solution you'd like
I would like to be able to disable the dependency on aws-ls-rc and have a feature to enable using openssl. For example, through rustls-openssl crate.

[jsonbailey]

@scasagrande thank you for filing this issue. I'll bring this up to the team to review so we can decide if we want to support this. We currently have a few other projects going on so I cannot commit to when we might be able to address this at the moment.

[scasagrande]

Great, thank you!