util: move inspect in separate file

The inspect function became very big and it's better to handle this
in a separate file.

PR-URL: #22845
Reviewed-By: John-David Dalton <[email protected]>
Reviewed-By: Refael Ackermann <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>
Reviewed-By: James M Snell <[email protected]>