Add full feature as an alternative to --all-features (#15971)

- closes #15967 

# Description


In 0.105 we introduced the feature `rustls-tls` which is enabled by
default and uses `rustls` instead of `openssl` on linux machines. Since
both `native-tls` and `rustls-tls` cannot be enabled at the same did
this break the `--all-features` flag. To provide an easy alternative, I
introduced the `full` feature here.

# User-Facing Changes

Instead of `cargo install nu --all-features`, you now can do `cargo
install nu --features full`.

# Tests + Formatting


No new tests, this is just a feature collection.

Cargo.toml

@@ -257,6 +257,10 @@ serial_test = "3.2"
 tempfile = { workspace = true }
 
 [features]
+# Enable all features while still avoiding mutually exclusive features.
+# Use this if `--all-features` fails.
+full = ["plugin", "rustls-tls", "system-clipboard", "trash-support", "sqlite"]
+
 plugin = [
   # crates
   "nu-cmd-plugin",