DDL table rewriting in dm parser pkg doesn't support foreign key rewrites

[a-cong]

Is your feature request related to a problem?

n/a

Describe the feature you'd like

The methods in the dm parser pkg skip foreign key nodes when traversing the AST in FetchDDLTable/RenameDDLTable - https://github.com/pingcap/tiflow/blob/master/dm/pkg/parser/common.go#L55. Bringing this up as we plan to use these methods to support schema/table routing in TiCDC, but for now the feature won't support foreign key rewrites.

Describe alternatives you've considered

No response

Teachability, Documentation, Adoption, Migration Strategy

No response