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In particular, calling non-scalar Node and Assembler methods should
always fail.

While at it, remove some unused code, since unions always have
representation strategies.

Brings up code coverage in bindnode from 72.7% to 75%.

It covers AssignKind, AssignNode, and AsKind for every combination of
assembler kind and method.

We also verify that a constructed scalar node behaves the same with
AsKind when using its representation, like the old test.

There's effectively a triple loop as a test table, so the subtest name
has up to three components separated by dashes, such as:

	TestSchema/Scalars/Bytes-AssignNode-String

We also use this test as a demo of quicktest instead of go-wish.

Finally, adapt bindnode to pass these tests just like codegen. This was
mainly a bunch of TODOs in the relevant methods.

We add node/tests.SchemaTestAll to simplify this task, meaning we don't
need to duplicate all test func declarations in node/bindnode.
SchemaTestAll is also flexible enough to allow running multiple
sub-tests per schema test in the future.

There were two remaining places in node/tests that still weren't using
ipld.DeepEqual, so fix those.

Finally, bindnode needed a couple of changes to fully support
ipld.DeepEqual. Most notable is iteration over maps, which required a
bit of a refactor to keep ordered keys.

Lots of TODOs and polishing to do, but it passes the schema/gen/go tests
with minimal changes.

Follow-up commits will continue filling in the gaps and adding
documentation, notably examples. We'll also make the tests run by
default, after a bit of refactoring.