Implement support for VQSR in QoB

[danking]

After using the VDS combiner to produce a joint-called dataset, a user needs to run Allele-Specific Variant Quality Score Recalibration. DSP maintains some documentation on AS-VQSR as well as the original VQSR.

AS-VQSR is an arbitrary program which we do not want to link into our codebase. We will only be support VQSR in QoB. The method requires three steps:

1. Export a partitioned VCF with the necessary annotations. gnomAD has a method, default_compute_info to produce these annotations from a sparse MT. We need to update that to support VDS (and, I suppose, its best to also support dense matrix tables).
2. Execute VQSR in parallel using Hail Batch.
3. Import the outputs of the VQSR jobs as a Hail Table.

[danking]

gnomAD team has a Batch-based VQSR method. After gnomAD v4 is released and ASHG 2023 is over, we should lean on gnomAD team to get this into Hail mainline. broadinstitute/gnomad_methods#470