make SentryConfiguration wasm-compatible

- Moved `hostname` lib behind conditional compiling
- provided alternative implementation of hostname::get for wasm-targets

src/types/config/types/sentry_configuration.rs

@@ -11,6 +11,20 @@ pub struct SentryConfiguration {
     pub environment: String,
 }
 
+impl SentryConfiguration {
+    #[cfg(not(target_arch = "wasm32"))]
+    fn get_hostname() -> std::io::Result<OsString> {
+        hostname::get()
+    }
+    #[cfg(target_arch = "wasm32")]
+    fn get_hostname() -> std::io::Result<OsString> {
+        Err(std::io::Error::new(
+            std::io::ErrorKind::Unsupported,
+            "Unsupported: wasm targets do not have a hostname",
+        ))
+    }
+}
+
 impl Default for SentryConfiguration {
     fn default() -> Self {
         Self {
@@ -19,7 +33,7 @@ impl Default for SentryConfiguration {
                 "https://241c6fb08adb469da1bb82522b25c99f@sentry.quartzinc.space/3",
             ),
             trace_sample_rate: 1.0,
-            environment: hostname::get()
+            environment: SentryConfiguration::get_hostname()
                 .unwrap_or_else(|_| OsString::new())
                 .to_string_lossy()
                 .to_string(),