Feature Request: Message-elide-region showing lines snipped and taking a string

[Sivaram Neelakantan]

The key C-c C-e currently elides a region of text and produces the
following

[...]

Can it have some customised options to show the number of lines of
text elided and also some text that the user can add?  Something like

[snipped 5 lines]
[5 lines of irrelevant text snipped]

Ideally, [...] or [snipped x lines] can be made default with the
option of the user being able to change the text.

 sivaram
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