add event keyword

src/main/kotlin/io/github/facilityapi/intellij/editor/FsdSyntaxHighlighter.kt

@@ -46,6 +46,7 @@ class FsdSyntaxHighlighter : SyntaxHighlighterBase() {
             FsdTypes.SERVICE,
             FsdTypes.DATA,
             FsdTypes.METHOD,
+            FsdTypes.EVENT,
             FsdTypes.ENUM,
             FsdTypes.ERRORS,
             FsdTypes.EXTERN,

src/main/kotlin/io/github/facilityapi/intellij/fsd.bnf

@@ -45,14 +45,15 @@ definition ::= (attribute_list* service_spec) markdown_remarks*
 service_spec ::= service identifier service_items { pin=1 }
 service_items ::= ('{' decorated_service_item* '}') | decorated_service_item
 decorated_service_item ::= attribute_list* service_item
-private service_item ::=  (extern_decl | enum_spec | data_spec | method_spec | error_set_spec) { recoverWhile=service_item_recover }
+private service_item ::=  (extern_decl | enum_spec | data_spec | method_spec | event_spec | error_set_spec) { recoverWhile=service_item_recover }
 private service_item_recover ::= !('[' | '}' | extern | enum | data | errors | method)
 
 private field_list ::= '{' (comment+ | decorated_field)* '}' { pin=1 }
 
 request_fields ::= field_list
 response_fields ::= field_list
 method_spec ::= method identifier_declaration request_fields ':' response_fields { pin=1 }
+event_spec ::= event identifier_declaration request_fields ':' response_fields { pin=1 }
 
 data_spec ::= data identifier_declaration field_list { pin=1 }
 

src/main/kotlin/io/github/facilityapi/intellij/lexer/_FsdLexer.flex

@@ -84,6 +84,7 @@ MARKDOWN_TEXT=.+
 
   "extern"                       { yybegin(EXTERN_DECL); return EXTERN; }
   "method"                       { yybegin(METHOD_BODY); return METHOD; }
+  "event"                        { yybegin(METHOD_BODY); return EVENT; }
   "data"                         { yybegin(DATA_BODY); return DATA; }
   "errors"                       { yybegin(LIST_BODY); return ERRORS; }
   "enum"                         { yybegin(LIST_BODY); return ENUM; }