Reject import declaration with semicolon in GHCi

Now GHCi rejects input containing an import declaration and semicolon,
and prints an appropriate error message. Before, the stuff after an
import declaration and semicolon got ignored (most of the time), without
telling the user about it. As the default behaviour of GHCi is to reject
multiple commands in a single input, we extend this behaviour to import
commands.

This patch fixes #10663.

(See https://phabricator.haskell.org/D1518 for the introduction of
`is_import` and `is_decl`.)

Reviewers: austin, bgamari

Reviewed By: bgamari

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D1726

GHC Trac Issues: #10663

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