feat!: align standard captures with upstream

Problem: Sharing highlight queries with upstream tree-sitter and
Helix is difficult.

Solution: Where reasonable, use capture names in tree-sitter's standard
list or Helix's Atom-style hierarchy.

Specifically:

* tree-sitter "standard capture names"
  (3f44b89685/highlight/src/lib.rs (L20-L72)):

  - `@parameter` -> `@variable.parameter`
  - `@field` -> `@variable.member`
  - `@namespace` -> `@module`
  - `@float` -> `@number.float`
  - `@symbol` -> `@string.special.symbol`
  - `@string.regex` -> `@string.regexp`
  - `@text.*` -> `@markup.*` (`strong`, `italic`, `link`, `strikethrough`; with exceptions; see below)
  - `@text.title` -> `@markup.heading`
  - `@text.literal` -> `@markup.raw`
  - `@text.reference` -> `@markup.link`
  - `@text.uri` -> `@markup.link.url` (in markup links)
  - `@string.special` -> `@markup.link.label` (non-url links)
  - `@punctuation.special` -> `@markup.list` (markdown lists only; move subitems from `@text.todo`)

* Helix captures
  (https://docs.helix-editor.com/master/themes.html#syntax-highlighting):

  - `@method` -> `@function.method`
  - `@method.call` -> `@function.method.call`
  - `@text.{todo,warning,note,danger}` -> `@comment.{error,warning,hint,info,todo}`
  - `@text.diff.{add,delete,}` -> `@diff.{plus,minus,delta}`
  - `@text.uri` -> `@string.special.url` (outside markup)
  - `@preproc` -> `@keyword.directive`
  - `@define` -> `@keyword.directive`(`.define`?)
  - `@storageclass` -> `@keyword.storage`
  - `@conditional` -> `@keyword.conditional`
  - `@debug` -> `@keyword.debug`
  - `@exception` -> `@keyword.exception`
  - `@include` -> `@keyword.import`
  - `@repeat` -> `@keyword.repeat`

* cleanup

  - remove some redundant `@conceal` (but still allow it for conceal-only patterns)
  - remove obsolete `@error` (syntax linting is out of scope for this repo)
  - sort, cleanup capture list in `CONTRIBUTING.md`

queries/starlark/highlights.scm

@@ -28,8 +28,8 @@
            "license"))
 
 ((attribute
-    attribute: (identifier) @field)
- (#lua-match? @field "^[%l_].*$"))
+    attribute: (identifier) @variable.member)
+ (#lua-match? @variable.member "^[%l_].*$"))
 
 ((assignment
   left: (identifier) @type.definition
@@ -108,30 +108,30 @@
 
 ;; Normal parameters
 (parameters
-  (identifier) @parameter)
+  (identifier) @variable.parameter)
 ;; Lambda parameters
 (lambda_parameters
-  (identifier) @parameter)
+  (identifier) @variable.parameter)
 (lambda_parameters
   (tuple_pattern
-    (identifier) @parameter))
+    (identifier) @variable.parameter))
 ; Default parameters
 (keyword_argument
-  name: (identifier) @parameter)
+  name: (identifier) @variable.parameter)
 ; Naming parameters on call-site
 (default_parameter
-  name: (identifier) @parameter)
+  name: (identifier) @variable.parameter)
 (typed_parameter
-  (identifier) @parameter)
+  (identifier) @variable.parameter)
 (typed_default_parameter
-  (identifier) @parameter)
+  (identifier) @variable.parameter)
 ; Variadic parameters *args, **kwargs
 (parameters
   (list_splat_pattern ; *args
-    (identifier) @parameter))
+    (identifier) @variable.parameter))
 (parameters
   (dictionary_splat_pattern ; **kwargs
-    (identifier) @parameter))
+    (identifier) @variable.parameter))
 
 
 ;; Literals
@@ -143,12 +143,12 @@
  (#eq? @variable.builtin "cls"))
 
 (integer) @number
-(float) @float
+(float) @number.float
 
 (comment) @comment @spell
 
-((module . (comment) @preproc)
-  (#lua-match? @preproc "^#!/"))
+((module . (comment) @keyword.directive)
+  (#lua-match? @keyword.directive "^#!/"))
 
 (string) @string
 [
@@ -243,14 +243,14 @@
 ] @keyword.return
 
 ((call
-  function: (identifier) @include
+  function: (identifier) @keyword.import
   arguments: (argument_list
-	(string) @conceal))
-  (#eq? @include "load"))
+	(string) @string))
+  (#eq? @keyword.import "load"))
 
-["if" "elif" "else" "match" "case"] @conditional
+["if" "elif" "else" "match" "case"] @keyword.conditional
 
-["for" "while" "break" "continue"] @repeat
+["for" "while" "break" "continue"] @keyword.repeat
 
 ["(" ")" "[" "]" "{" "}"] @punctuation.bracket
 
@@ -274,7 +274,7 @@
   function: (identifier) @_func
   arguments: (argument_list
     (keyword_argument
-	  name: (identifier) @field)))
+	  name: (identifier) @variable.member)))
   (#eq? @_func "struct"))
 
 ;; Function calls
@@ -284,7 +284,7 @@
 
 (call
   function: (attribute
-              attribute: (identifier) @method.call))
+              attribute: (identifier) @function.method.call))
 
 ((call
    function: (identifier) @constructor)