refactor(bigquery/storage/managedwriter): add custom client options #7490
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This PR revisits the expected behavior for config knobs in the client. Previously, all configuration was done when instantiating a writer (aka a ManagedStream). There are some chicken-and-egg problems related to multiplex settings, as connection options are decoupled from individual writers.
This PR adds the following unexported custom client options (but does not yet use them for anything):
This PR also removes the still-unexported enableMultiplex from the set of defined WriterOption options which can be passed when instantiating individual writes.
Additionally, this refactor includes a correctness fix for the traceID option that was causing the traceID to duplicate the initial token.
Towards: #7103