feat(bigquery/storage/managedwriter): add state tracking #4407
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This PR introduces two new types: AppendResult - tracks the progress of an individual row append to completion, either success or error. Successful appends _may_ have an associated offset, failed appends will have an associated error. The AppendResult has a blocking method users can interrogate. pendingWrite - handles the state management for a set of rows appended as a group. There's a 1:many relationship between pendingWrite:AppenResult(s), so as a pendingWrite completes all associated AppendResult references should be updated.
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This PR introduces two new types:
AppendResult - tracks the progress of an individual row append to
completion, either success or error. Successful appends may have
an associated offset, failed appends will have an associated error.
The AppendResult has a blocking method users can interrogate.
pendingWrite - handles the state management for a set of rows appended
as a group. There's a 1:many relationship between
pendingWrite:AppendResult(s), so as a pendingWrite completes all
associated AppendResult references should be updated.
Towards: #4366