Make traceTimestampTable be configurable.

[fusiyuan2010]

Am I missing something? While I can specify the trace table in the datasource configuration, I can not change the value of traceTimestampTable, while is a necessary table to look into trace details, the default value of it is 'otel_traces_trace_id_ts' and I had to create table in such name.

[SpencerTorres]

This has been reported in #761

Here's the explanation for the fix I added: #761 (comment)

Add your comments there if this works for you or if you need further flexibility. There's some other workarounds in that thread too.
Thanks!