x/term: add history APIs.

[ldemailly]

In order for users of the library to save and restore the history, expose:

• History() []string: returns a slice of strings containing the history of entered commands so far.

• AddToHistory(cmd ...string): populates history.

• NewHistory(capacity int): resets the history to a new one of the given capacity.

• AutoHistory(bool) sets whether lines are automatically added to the history (defaults remains true).

• ReplaceLatest(entry string) string replaces the most recent entry (useful for correcting invalid commands).

• Also avoid adding adjacent exact duplicates to the history (consuming slots unnecessarily)

• Added a test, more comments, and expose the 100 default history constant.

Demonstration of use fortio/terminal@77eee7b

Fixes golang/go#68780

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