Relayer module

[meyer9]

State manager to hold state from shards including full vs. partial state.

• [x] Specify P2P/RPC interface for accessing packages
• [x] Specify how packages/transactions are generated and held
• [x] Specify configuration options
• [x] Build module
  • [x] Core
  • [x] State Storage
    • [x] Optimize CSMT
    • [x] Transactional layer
    • [x] Allow CSMT to use a disk-based backend
    • [x] Flexible CSMT transactions
  • [x] Mempool
    • [x] Partial State Transition
    • [x] State transactions
  • [x] Package Generation
  • [x] P2P
  • [x] Witness Protobufs
  • [x] Package Protobufs
  • [x] Host Node
  • [x] Command Handlers
• [x] Integration/unit tests

[meyer9]

Added basic specification. Now, going to work on implementing disk storage for state.

[meyer9]

Fixed some bugs in the CSMT witness generation functions.

[codecov-io]

Codecov Report

Merging #103 into master will increase coverage by 0.91%. The diff coverage is 56.81%.

@@            Coverage Diff             @@
##           master     #103      +/-   ##
==========================================
+ Coverage   49.13%   50.04%   +0.91%     
==========================================
  Files          43       42       -1     
  Lines        4441     5405     +964     
==========================================
+ Hits         2182     2705     +523     
- Misses       1981     2322     +341     
- Partials      278      378     +100

Impacted Files	Coverage Δ
shard/transfer/transfer_shard.go	100% <ø> (ø)	:arrow_up:
shard/state/argument_context.go	7.93% <ø> (ø)
beacon/db/badger.go	0% <ø> (ø)	:arrow_up:
beacon/db/memory.go	26.47% <ø> (ø)	:arrow_up:
shard/state/state.go	43.83% <ø> (-16.46%)	:arrow_down:
shard/state/manager.go	0% <ø> (ø)
shard/state/execution.go	77% <ø> (ø)
shard/state/interface.go	0% <ø> (ø)
shard/transfer/transfer_shard_code.go	16.66% <ø> (ø)	:arrow_up:
beacon/mempool.go	0% <0%> (ø)	:arrow_up:
... and 32 more

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