EthDebug Format support for Variable Tracking

[veniger]

Schemas that need to be defined in order to provide enough data to support finding and decoding vm local variables and storage variables

• [x] ethdebug/format/info
• [x] ethdebug/format/program
• [ ] ethdebug/format/program/instruction
• [ ] ethdebug/format/program/context
• [x] ethdebug/format/program/context/variables
• [x] ethdebug/format/type
• [x] ethdebug/format/pointer

[veniger]

In order to slim down the size of debug data, context should be changed to stateful instead of tracing each variable on each instruction by having variables enter or leave scope

[veniger]

The deduplication issue as defined in #139 should be resolved for this issue also