Add isLazy prop to CPopover

[VeraGoerisch]

Is your feature request related to a problem? Please describe.
CPopover in Vue Chakra UI doesn't have isLazy prop which is present in Chakra UI for React so there is no way to defer CPopoverContent rendering until the popover is open.

Describe the solution you'd like
CPopover has isLazy prop.

Describe alternatives you've considered
Current solutions include adding a bunch of v-if's around elements present in CPopoverContent, which sort of works but would like to have a cleaner solution.