Preview 4

Contains incremental improvements towards the first stable release.

New features:

• Alter table ownership support #139
• Support resolving one master address to multiple addresses #145

Optimizations and refactors:

• Optimize key encoding #141
• Simplify and optimize KuduPartitioner #150
• Improve exception handling #146

Bug fixes:

• Try a scan at a different server when quiescing #151
• Fix negotiation over TLSv1.3 #154

Misc:

• Switch serialization library to Google.Protobuf #153
• Add .NET 5 target #140
• Use .NET threadpool scheduler #155
• Update dependencies

Testing:

• Test against Kudu 1.15