`rustls`’s `aws-lc-rs` backend is enabled unconditionnally

[CBenoit]

Confirmed in ngrok v0.15.0.

In futures-rustls’s Cargo.toml, aws-lc-rs is feature enabled by default:

[features]
default = ["aws-lc-rs", "tls12", "logging"] # <- enabling aws-lc-rs by default
aws-lc-rs = ["rustls/aws_lc_rs"]
aws_lc_rs = ["aws-lc-rs"]
early-data = []
fips = ["rustls/fips"]
logging = ["rustls/logging"]
ring = ["rustls/ring"]
tls12 = ["rustls/tls12"]

And in ngrok’s Cargo.toml:

futures-rustls = { version = "0.26.0" }

futures-rustls is depended upon with all the default features.

This prevent the consumer of ngrok to control the backend to be used with rustls.

It would help to expose the same features as futures-rustls to choose between the two.