Added textarea label for AutosuggestTextbox component

• Added:
- textarea label for AutosuggestTextbox component

app/javascript/gabsocial/components/autosuggest_textbox.js

@@ -259,7 +259,11 @@ export default class AutosuggestTextbox extends ImmutablePureComponent {
     return (
       <Fragment>
         <div className={textareaContainerClasses}>
+          <label htmlFor={id} className={_s.visiblyHidden}>
+            {placeholder}
+          </label>
           <Textarea
+            id={id}
             inputRef={this.setTextbox}
             className={textareaClasses}
             disabled={disabled}

app/javascript/gabsocial/features/compose/components/compose_form.js

@@ -324,6 +324,7 @@ class ComposeForm extends ImmutablePureComponent {
                     onPaste={onPaste}
                     autoFocus={shouldAutoFocus}
                     small={shouldCondense}
+                    id='comment-composer'
                   />
 
                   <div className={actionsContainerClasses}>
@@ -414,6 +415,7 @@ class ComposeForm extends ImmutablePureComponent {
                   onPaste={onPaste}
                   autoFocus={shouldAutoFocus}
                   small={shouldCondense}
+                  id='main-composer'
                 />
 
                 {