Ordered set lattices.

[xcharleslin]

• Anna-side C++ representation.
• Anna-side serialization and deserialization.
• Client-side python representation.
• Anna C++ client interface.
• Python IPC client serialization and deserialization.

[codecov[bot]]

Codecov Report

Merging #87 into master will increase coverage by 0.29%. The diff coverage is 98.14%.

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
+ Coverage   71.53%   71.82%   +0.29%     
==========================================
  Files          67       68       +1     
  Lines        2930     2964      +34     
==========================================
+ Hits         2096     2129      +33     
- Misses        834      835       +1

Impacted Files	Coverage Δ
functions/cache/src/causal_cache_utils.cpp	64.55% <ø> (ø)	:arrow_up:
...ns/cache/src/causal_cache_kvs_response_handler.cpp	45% <ø> (ø)	:arrow_up:
kvs/tests/include/lattices/run_lattice_tests.cpp	100% <ø> (ø)	:arrow_up:
kvs/include/kvs/server_utils.hpp	61.9% <ø> (ø)	:arrow_up:
include/common.hpp	80.58% <ø> (ø)	:arrow_up:
include/lattices/lattice.hpp	100% <ø> (ø)	:arrow_up:
include/lattices/cross_causal_lattice.hpp	100% <100%> (ø)	:arrow_up:
include/lattices/vector_clock_pair_lattice.hpp	93.75% <100%> (-0.99%)	:arrow_down:
include/lattices/lww_pair_lattice.hpp	100% <100%> (ø)	:arrow_up:
include/lattices/core_lattices.hpp	96.61% <100%> (+0.77%)	:arrow_up:
... and 7 more

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[xcharleslin]

@cw75 can you approve again? i had to force-push after rebasing