ISTWCMS-5879 Create column separator, section separator and section spacing options for sections

config/install/layout_builder_styles.group.column_separator.yml

+langcode: en
+status: true
+dependencies: {  }
+id: column_separator
+label: 'Column separator'
+multiselect: single
+form_type: checkboxes
+required: true
+weight: 0

config/install/layout_builder_styles.group.section_separator.yml

+langcode: en
+status: true
+dependencies: {  }
+id: section_separator
+label: 'Section separator'
+multiselect: single
+form_type: checkboxes
+required: true
+weight: 0

config/install/layout_builder_styles.group.section_spacing.yml

+langcode: en
+status: true
+dependencies: {  }
+id: section_spacing
+label: 'Section spacing'
+multiselect: single
+form_type: checkboxes
+required: true
+weight: 0