chore(examples): modify pausable

[leohhhn]

Description

Prevously, the pausable object embedded the ownable object directly, and with the intended usage of both packages being the following, ownable functions were being duplicated:

var (
	Ownable = ownable.NewWithAddress(std.Address("xyz"))
	Pausable = pausable.NewFromOwnable(Ownable)
)

This PR names the ownable inside pausable as a private field and exposes a getter in case someone needs it for some reason. It also removes the New() function, which doesn't make too much sense right now as the pausable needs to be paired with ownable - this might change later but for now this should be the way.

[Gno2D2]

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[jefft0]

The code does what the PR description says that it does. There is a test for new functions. All CI checks pass (except "Merge Requirements" as usual). Ready for a core dev to decide if this change is wanted.

[codecov]

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