Swap token that selects the component class mounted as the recursive
body of <cngx-filter-builder>. The shell renders the resolved type via
<ng-container *ngComponentOutlet="bodyType; inputs: { templates }"> so
consumers can replace the entire recursive renderer without forking the
shell.
Default: CngxFilterBuilderBody. Override at root or component scope:
Replacements must accept the templates: CngxFilterBuilderTemplateRegistry
input the default body declares and read the host context through
CNGX_FILTER_BUILDER_HOST. Mirrors CNGX_SELECT_PANEL_VIEW_HOST in
@cngx/forms/select.