Implement DOMNode::parentElement and DOMNameSpaceNode::parentElement

ref: https://dom.spec.whatwg.org/#parent-element

Closes GH-11679.

Implement DOMNode::isConnected and DOMNameSpaceNode::isConnected

ref: https://dom.spec.whatwg.org/#dom-node-isconnected

Closes GH-11677.

Fix GH-9628: Implicitly removing nodes from \DOMDocument breaks existing references

Change the way lifetime works in ext/libxml and ext/dom

Previously, a node could be freed even wh

Fix GH-9628: Implicitly removing nodes from \DOMDocument breaks existing references

Change the way lifetime works in ext/libxml and ext/dom

Previously, a node could be freed even when holding a userland reference
to it. This resulted in exceptions when trying to access that node after
it has been implicitly or explicitly removed. After this patch, a node
will only be freed when the last userland reference disappears.

Fixes GH-9628.
Closes GH-11576.

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Fix #70359 and #78577: segfaults with DOMNameSpaceNode

* Fix type confusion and parent reference
* Manually manage the lifetime of the parent
* Add regression tests
* Break out t

Fix #70359 and #78577: segfaults with DOMNameSpaceNode

* Fix type confusion and parent reference
* Manually manage the lifetime of the parent
* Add regression tests
* Break out to a helper, and apply the use-after-free fix to xpath

Closes GH-11402.

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