WIP: Add a setting to visually redact enviroment variables (#7124)

Release Notes:

- Added bash syntax highlighting to `.env` files. 
- Added a `private_files` setting for configuring which files should be
considered to contain environment variables or other sensitive
information.
- Added a `redact_private_values` setting to add or remove censor bars
over variable values in files matching the `private_files` patterns.
-(internal) added a new `redactions.scm` query to our language support,
allowing different config file formats to indicate where environment
variable values can be identified in the syntax tree, added this query
to `bash`, `json`, `toml`, and `yaml` files.

---------

Co-authored-by: Nathan <nathan@zed.dev>

crates/zed/src/languages.rs

@@ -357,6 +357,7 @@ const QUERY_FILENAME_PREFIXES: &[(
     ("embedding", |q| &mut q.embedding),
     ("injections", |q| &mut q.injections),
     ("overrides", |q| &mut q.overrides),
+    ("redactions", |q| &mut q.redactions),
 ];
 
 fn load_queries(name: &str) -> LanguageQueries {