LP1837260 FM Record editor 'inline' display mode

LP1837260 FM Record editor 'inline' display mode

Adds support for a new @Input() attribute called "displayMode", which
defaults to "dialog".  When the value is set to "inline", the editor
pane will be rendered inline within the page where the
<eg-fm-record-editor/> element resides.

Adds support for success/fail toasts.

Implements the handlers for the previously defined onSave$, onError$,
and onCancel$ EventEmitters, primarly so callers can interact with the
editor in "inline" mode where no "close()" operation occurs.

Sandbox example included.

Signed-off-by: Bill Erickson <berickxx@gmail.com>