Building on Windows fails

[pressing-buttons]

Not sure if this is intended to work, but pgcat cannot be built on Windows 10.

If Windows is not a supported Platform, then please closed the issue.

Steps to reproduce the behavior:

1. clone the pgcat git repository
2. open a command line in that directory
3. run cargo build --release

Compiling fails with:

warning: use of deprecated function `base64::decode`: Use Engine::decode
  --> src\scram.rs:84:34
   |
84 |         let salt = match base64::decode(&server_message.salt) {
   |                                  ^^^^^^
   |
   = note: `#[warn(deprecated)]` on by default

warning: use of deprecated function `base64::encode`: Use Engine::encode
   --> src\scram.rs:114:35
    |
114 |         let cbind_input = base64::encode(&cbind_input);
    |                                   ^^^^^^

warning: use of deprecated function `base64::encode`: Use Engine::encode
   --> src\scram.rs:152:58
    |
152 |         match write!(&mut self.message, ",p={}", base64::encode(&*client_proof)) {
    |                                                          ^^^^^^

warning: use of deprecated function `base64::decode`: Use Engine::decode
   --> src\scram.rs:164:38
    |
164 |         let verifier = match base64::decode(&final_message.value) {
    |                                      ^^^^^^

warning: `pgcat` (lib) generated 4 warnings
error[E0432]: unresolved import `tokio::signal::unix`
  --> src\main.rs:53:13
   |
53 |     signal::unix::{signal as unix_signal, SignalKind},
   |             ^^^^ could not find `unix` in `signal`

For more information about this error, try `rustc --explain E0432`.
warning: `pgcat` (bin "pgcat") generated 4 warnings (4 duplicates)
error: could not compile `pgcat` due to previous error; 4 warnings emitted

Using cargo 1.66.1 (ad779e08b 2023-01-10)

[levkk]

We just need a signal wrapper on Windows to control behavior similar to how signal does on Unix. I saw this crate, but never used it myself: https://docs.rs/wintrap/latest/wintrap/

Currently Windows support is not in scope for us, but if you'd like to add it, a PR is welcome.

[pressing-buttons]

OK, feel free to close this issue then.

It might be helpful to add the fact that Windows is not supported to the README.