Rollup merge of #123103 - compiler-errors:inherited-is-a-weird-name, r=oli-obk

Rename `Inherited` -> `TypeckRootCtxt`

`Inherited` is a confusing name. Rename it to `TypeckRootCtxt`.

I don't think this needs a type MCP or anything since it's not nearly as pervasive as `FnCtxt` , for example.

r? `@lcnr` `@oli-obk`

Author: matthiaskrgr