Make classes IKernelTypeStrResolver and IKernelLookup have protected destructors.

[edgchen1]

Description

Make classes IKernelTypeStrResolver and IKernelLookup have protected destructors.

https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#c35-a-base-class-destructor-should-be-either-public-and-virtual-or-protected-and-non-virtual

Motivation and Context

Prevent destruction through base class pointer. Address static analysis warning.