v0.3.0 Released audit log、sql tracing, previewed column encryption and decryption.

[dk-lockdown]

We previewed audit log at v0.2.0, now we released audit log and sql tracing. And, there are a sample of sql tracing, If we run this sample, we can view complete distributed transaction tracing data at http://localhost:16686/. And we previewed column encryption and decryption.

Features

• add more trace span and integrate with jaeger (177) (d703959)
• add trace for BackendConnection (204) (36b3894)
• support column encryption (24) (946c190)

Bug Fixes

• fix: construct a TraceContext with the correct traceparent (203) (3ecb2cc)

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