cargo: Rename workspace-local library starting with b to servo_* (#43552)

Follow up of #43526. This addresses Nico's comment:
https://github.com/servo/servo/pull/43526#issuecomment-4104953308

- `bluetooth_traits` -> `servo_bluetooth_traits`
- `base` -> `servo_base`
- `bluetooth` -> `servo_bluetooth`
- `background_hang_monitor` -> `servo_background_hang_monitor`

Testing: This should not change any behaviour.

---------

Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>

components/script/dom/html/htmlscriptelement.rs

@@ -9,7 +9,6 @@ use std::fs::read_to_string;
 use std::path::PathBuf;
 use std::rc::Rc;
 
-use base::id::WebViewId;
 use dom_struct::dom_struct;
 use encoding_rs::Encoding;
 use html5ever::{LocalName, Prefix, local_name};
@@ -20,6 +19,7 @@ use net_traits::request::{
     CorsSettings, Destination, ParserMetadata, Referrer, RequestBuilder, RequestId,
 };
 use net_traits::{FetchMetadata, Metadata, NetworkError, ResourceFetchTiming};
+use servo_base::id::WebViewId;
 use servo_url::ServoUrl;
 use style::attr::AttrValue;
 use style::str::{HTML_SPACE_CHARACTERS, StaticStringVec};