… type declarations

The event names `onPointerEnterCapture` and
`onPointerLeaveCapture` are erroneously included
in the types for react 16 and 17 - these have
never been valid event names, but the decision has
been taken to leave them in place based on the
definitely-typed backporting policy. However,
these event names _have_ been removed from the
types for React 18.

In a few places in xycharts, properties are
removed from components with DOM element props
using the `Omit` utility type. When the
declarations are generated, these `Omit`s are
transformed into `Pick`s with the inverted set of
keys. This results in all known properties for
these components (including
`onPointerEnterCapture` and
`onPointerLeaveCapture`) being included. This
causes compilation errors for consumers of this
package that use React 18.

This commit proposes a heavily targeted fix by
including the removed event names in the string
unions passed to `Omit`. This is somewhat
distasteful, because it only resolves the issue
for existing occurrences - any new places in the
codebase with this pattern will need to be
specifically handled.

Possible future improvements:
1. Test the type declarations in this library
   against the React 18 types in CI to ensure we
   handle future occurrences of this pattern.
2. Find a general solution to this. The only
   possibility I can come up with is patching the
   react type declarations used in this library to
   remove these events - since they aren't valid
   anyway, it should be fine to remove them.