daemon: libstore: add assertStorePathStrict and helpers.

isStorePath is a lightweight check that only verifies that the given path is
in the store and doesn't have any '/' characters after the store prefix.  This
is insufficiently strict for verifying that a given path is actually a valid
store path.

isStoreName is extracted from checkStoreName, and to preserve the error
messages may have a second argument giving a string to write to with the
problem description in the case that isStoreName returns false.

* nix/libstore/store-api.hh (assertStorePathStrict, isStoreName,
  isStoreBasenameStrict, isStorePathStrict): new functions.
* nix/libstore/worker-protocol.hh (readStorePathStrict): new function.
  (readStorePathsStrict): new template.
* nix/libstore/store-api.cc (assertStorePathStrict, isStoreName,
  isStoreBasenameStrict, isStorePathStrict, readStorePathStrict,
  readStorePathsStrict): provide implementations.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

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