Add recursion limit for dynamic code

[klauspost]

Prevent adversarial stack exhaustion on:

Decoder:

• CopyNext
• Skip
• ReadIntf
• ReadMapStrIntf
• WriteToJSON

Standalone:

• Skip
• ReadMapStrIntfBytes
• ReadIntfBytes
• CopyToJSON
• UnmarshalAsJSON

Limit is set to 100K recursive map/slice operations. I know it is insanely high, but we are really just trying to not run out of stack.