Vitess v8 VTctld custom branch + sizes-only

[setassociative]

There were merge conflicts here, would appreciate extra eyes.

Two items of note

1️⃣ the following diff no longer seemed relevant given that the grpc interface had been evolved to support sizes only as a first class flag

+       if *tableSizesOnly {
+               sizeTds := make([]*tabletmanagerdatapb.TableDefinition, len(sd.TableDefinitions))
+               for i, td := range sd.TableDefinitions {
+                       sizeTds[i] = &tabletmanagerdatapb.TableDefinition{
+                               Name:       td.Name,
+                               Type:       td.Type,
+                               RowCount:   td.RowCount,
+                               DataLength: td.DataLength,
+                       }
+               }
+
+               sd.TableDefinitions = sizeTds
+       }

2️⃣ The other call out is. that the incoming change wanted to return printJSON(wr.Logger(), resp.Schema) as the return type which diverged from upstream's mainline so I believe this is the render bug we fixed previously.

[ajm188]

actual guts of the GetSchema look good, but there's an issue with the conflict resolution that needs to be fixed first!

[ajm188]

This line is unused (it was, before you could pass TableSizesOnly directly to the rpc), and probably will cause go build to not succeed

[setassociative]

already go it but not before you saw :shamebell: