Expand DSL so we can check timestamps on specific properties

### OS/platform

Linux

### Emacs version and provenance

29 - compiled from source

### Org version and provenance

9.7.5 - from elpa

### org-ql package version and provenance

0.8.6 - melpa

### Description

I would love to be able to write something like this:

```elisp
;; find all headings with CUSTOM_PROP where the value is a timestamp in the past
(org-ql-search (org-agenda-files)
'(property :CUSTOM_PROP '(ts-active :to :today)))
```

I know I can write custom code to match presence of CUSTOM_PROP and then do precise validation but I think it would be amazing if I could do this all within org-ql's DSL!

### Etc.

_No response_