INSTANCE scope system variable not support yet.
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Description
## Enhancement
The design document [docs/design/2021-12-08-instance-scope.md](https://github.com/pingcap/tidb/blob/master/docs/design/2021-12-08-instance-scope.md) has proposed a new scope *INSTANCE* for system variables. But it is not implemented yet.
By the guidance of the [Design Details](https://github.com/pingcap/tidb/blob/master/docs/design/2021-12-08-instance-scope.md#detailed-design), this feature enhancement could be implemented by several steps:
- [x] Introduce the new `ScopeInstance` into tidb
- [x] Resolve the historical compatibility issue
- [ ] [Mapping configuration file settings to system variables](https://github.com/pingcap/tidb/issues/33769)
- [ ] ...
The following steps could be specified after the existent steps are finished.
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Assessment
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