Oracle_sync_stree_demo

[itwaix]

Operate against Oracle database, use kona

[tencent-adm]

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[huishi-hs]

Thanks for your PR! This is good step for us.

there are already two database related demo, one is mysql and another is iotdb(Time Series Database). Oracle test should be similar with mysql and my comment is keep demos not duplicate.

would like see others fiber application from you.

[huishi-hs]

this needs be a separate PR. not related with Oracle_sync_stree_demo