.with_materializers() added helpful error message

[zilto]

When first using .with_materializers(), it's not obvious that it expects:

.with_materializers(to.json(...), to.parquet(...))

Rather than the invalid:

.with_materializers([to.json(...), to.parquet(...)])

If encountering the above case, the error will now specify to unpack the sequence with *, leading to the valid code

.with_materializers(*[to.json(...), to.parquet(...)])

Changes

• explicitly catch an invalid argument for .with_materializers() when building the driver

[skrawcz]

Add a unit test for this please.