[whatwg/dom] Define maximum length and handling of CharacterData nodes (Issue #1351)

Currently we pretend that all `CharacterData` nodes (`Text`, `CDATASection`, `ProcessingInstruction`, and `Comment`) can have infinite length. In practice however it seems the upper limit has to be JavaScript's `String`'s maximum length, which is 2<sup>53</sup> &minus; 1.

Should we standardize on that and attempt to deal with the consequences for `wholeText`, `normalize()`, etc?

cc @rniwa @smaug---- @mfreed7 

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