[Task]: Investigate inspector checks and see if they can share a common base with TCK

a2a-inspector does a lot of things, but one of them is to check if an agent is compliant with what is declared in the agent-card.
TCK does a lot of things, but one of them is the same as above.
We need to compare the code doing the same (logically at least) and see if there is any chance to use a common base code and/or make available advanced checks from TCK to the inspector.

[] compare the 2 projects
[] evaluate if a common base makes sense
[] consider advanced checks from TCK exposed to inspector
[] make a plan for any follow-up