Convert the table component templates to methods

They're all really basic and none contain any logic, there's no real
need to rely on templates.

app/components/govuk_component/table_component.rb

@@ -20,6 +20,10 @@ def initialize(id: nil, rows: nil, head: nil, caption: nil, first_cell_is_header
       build(*(head ? [head, rows] : [rows[0], rows[1..]]), caption_text)
     end
 
+    def call
+      tag.table(**html_attributes) { safe_join([caption, head, bodies]) }
+    end
+
   private
 
     def build(head_data, body_data, caption_text)

app/components/govuk_component/table_component/body_component.rb

@@ -15,6 +15,10 @@ def initialize(rows: nil, first_cell_is_header: false, classes: [], html_attribu
     build_rows_from_row_data(rows, first_cell_is_header)
   end
 
+  def call
+    tag.tbody(**html_attributes) { safe_join(rows) }
+  end
+
 private
 
   def build_rows_from_row_data(data, first_cell_is_header)

app/components/govuk_component/table_component/head_component.rb

@@ -17,6 +17,10 @@ def initialize(rows: nil, classes: [], html_attributes: {})
     build_rows_from_row_data(rows)
   end
 
+  def call
+    tag.thead(**html_attributes) { safe_join(rows) }
+  end
+
 private
 
   def build_rows_from_row_data(data)

app/components/govuk_component/table_component/row_component.rb

@@ -33,6 +33,10 @@ def self.from_body(*args, **kwargs, &block)
     new(*args, parent: 'tbody', **kwargs, &block)
   end
 
+  def call
+    tag.tr(**html_attributes) { safe_join(cells) }
+  end
+
 private
 
   def build_cells_from_cell_data(cell_data)