Use language settings' prettier parsers as a fallback for files with no path (#12273)

Follow-up of
https://github.com/zed-industries/zed/pull/12095#issuecomment-2123230762
reverting back part of https://github.com/zed-industries/zed/pull/11558
that was related to `language.toml` parsing.

Now all extensions that define `prettier_parser_name` in their language
configs, will enable formatting untitled buffers without any extra
language settings like

```json
{
  "languages": {
    "JSON": {
      "prettier": {
        "allowed": true,
        "parser": "json"
      }
    }
  }
}
```



Release Notes:

- Improved ergonomics of untitled buffer formatting with prettier, no
extra language settings are needed by default.

crates/languages/src/css/config.toml

@@ -11,3 +11,4 @@ brackets = [
 ]
 word_characters = ["-"]
 block_comment = ["/* ", " */"]
+prettier_parser_name = "css"

crates/languages/src/javascript/config.toml

@@ -17,6 +17,7 @@ brackets = [
 word_characters = ["$", "#"]
 tab_size = 2
 scope_opt_in_language_servers = ["tailwindcss-language-server", "emmet-language-server"]
+prettier_parser_name = "babel"
 
 [overrides.element]
 line_comments = { remove = true }

crates/languages/src/json/config.toml

@@ -9,3 +9,4 @@ brackets = [
     { start = "\"", end = "\"", close = true, newline = false, not_in = ["string"] },
 ]
 tab_size = 2
+prettier_parser_name = "json"

crates/languages/src/markdown/config.toml

@@ -14,3 +14,4 @@ brackets = [
 
 tab_size = 2
 soft_wrap = "preferred_line_length"
+prettier_parser_name = "markdown"

crates/languages/src/tsx/config.toml

@@ -15,6 +15,7 @@ brackets = [
 ]
 word_characters = ["#", "$"]
 scope_opt_in_language_servers = ["tailwindcss-language-server", "emmet-language-server"]
+prettier_parser_name = "typescript"
 tab_size = 2
 
 [overrides.element]

crates/languages/src/typescript/config.toml

@@ -14,4 +14,5 @@ brackets = [
     { start = "/*", end = " */", close = true, newline = false, not_in = ["string", "comment"] },
 ]
 word_characters = ["#", "$"]
+prettier_parser_name = "typescript"
 tab_size = 2

crates/languages/src/yaml/config.toml

@@ -10,4 +10,5 @@ brackets = [
 ]
 
 increase_indent_pattern = ":\\s*[|>]?\\s*$"
+prettier_parser_name = "yaml"
 tab_size = 2