dap: Allow user to pass custom envs to adapter via project settings (#40490)

It is now possible to configure logging level of CodeLLDB adapter via
envs specified in project settings like so:

```
{
    "dap": {
        "CodeLLDB": {
            "envs": {
                "RUST_LOG": "debug"
            }
        }
    }
}
```

Release Notes:

- N/A

crates/dap_adapters/src/python.rs

@@ -1,5 +1,6 @@
 use crate::*;
 use anyhow::{Context as _, bail};
+use collections::HashMap;
 use dap::{DebugRequest, StartDebuggingRequestArguments, adapters::DebugTaskDefinition};
 use fs::RemoveOptions;
 use futures::{StreamExt, TryStreamExt};
@@ -16,7 +17,6 @@ use std::ffi::OsString;
 use std::net::Ipv4Addr;
 use std::str::FromStr;
 use std::{
-    collections::HashMap,
     ffi::OsStr,
     path::{Path, PathBuf},
 };
@@ -312,6 +312,7 @@ impl PythonDebugAdapter {
         config: &DebugTaskDefinition,
         user_installed_path: Option<PathBuf>,
         user_args: Option<Vec<String>>,
+        user_env: Option<HashMap<String, String>>,
         python_from_toolchain: Option<String>,
     ) -> Result<DebugAdapterBinary> {
         let tcp_connection = config.tcp_connection.clone().unwrap_or_default();
@@ -349,7 +350,7 @@ impl PythonDebugAdapter {
                 timeout,
             }),
             cwd: Some(delegate.worktree_root_path().to_path_buf()),
-            envs: HashMap::default(),
+            envs: user_env.unwrap_or_default(),
             request_args: self.request_args(delegate, config).await?,
         })
     }
@@ -744,6 +745,7 @@ impl DebugAdapter for PythonDebugAdapter {
         config: &DebugTaskDefinition,
         user_installed_path: Option<PathBuf>,
         user_args: Option<Vec<String>>,
+        user_env: Option<HashMap<String, String>>,
         cx: &mut AsyncApp,
     ) -> Result<DebugAdapterBinary> {
         if let Some(local_path) = &user_installed_path {
@@ -752,7 +754,14 @@ impl DebugAdapter for PythonDebugAdapter {
                 local_path.display()
             );
             return self
-                .get_installed_binary(delegate, config, Some(local_path.clone()), user_args, None)
+                .get_installed_binary(
+                    delegate,
+                    config,
+                    Some(local_path.clone()),
+                    user_args,
+                    user_env,
+                    None,
+                )
                 .await;
         }
 
@@ -790,12 +799,13 @@ impl DebugAdapter for PythonDebugAdapter {
                     config,
                     None,
                     user_args,
+                    user_env,
                     Some(toolchain.path.to_string()),
                 )
                 .await;
         }
 
-        self.get_installed_binary(delegate, config, None, user_args, None)
+        self.get_installed_binary(delegate, config, None, user_args, user_env, None)
             .await
     }