Feature-guard the sled light store and hide the dependency on sled

[romac]

See: #430 (comment)

• Referenced an issue explaining the need for the change
• Updated all relevant documentation in docs
• Updated all code comments where relevant
• Wrote tests
• Updated CHANGELOG.md

[codecov-io]

Codecov Report

Merging #772 (68d7b5c) into master (e65337a) will not change coverage.
The diff coverage is 0.0%.

@@          Coverage Diff           @@
##           master    #772   +/-   ##
======================================
  Coverage    50.6%   50.6%           
======================================
  Files         197     197           
  Lines       13567   13567           
  Branches     3249    3247    -2     
======================================
  Hits         6869    6869           
  Misses       6336    6336           
  Partials      362     362           

Impacted Files	Coverage Δ
light-client/examples/light_client.rs	0.0% <0.0%> (ø)
light-client/src/store.rs	52.0% <ø> (ø)
light-client/src/store/sled.rs	0.0% <0.0%> (ø)
light-node/src/commands/initialize.rs	0.0% <0.0%> (ø)
light-node/src/commands/start.rs	0.0% <0.0%> (ø)
light-client/src/macros.rs	15.2% <0.0%> (ø)

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[liamsi]

Nice to look at some Rust code for a change :-)

LGTM

[xla]

🍁 ✴️ 🎤 🚚