Split out verifier parts of tendermint-light-client to tendermint-light-client-verifier

[soareschen]

Fixes #1027.

• Referenced an issue explaining the need for the change
• Updated all relevant documentation in docs
• Updated all code comments where relevant
• Wrote tests
• Added entry in .changelog/

[codecov-commenter]

Codecov Report

Merging #1071 (a4d7dc7) into master (a121189) will increase coverage by 1.9%.
The diff coverage is 78.5%.

@@           Coverage Diff            @@
##           master   #1071     +/-   ##
========================================
+ Coverage    62.7%   64.6%   +1.9%     
========================================
  Files         236     238      +2     
  Lines       21192   20571    -621     
========================================
+ Hits        13296   13307     +11     
+ Misses       7896    7264    -632     

Impacted Files	Coverage Δ
light-client-js/src/lib.rs	3.7% <ø> (ø)
light-client-js/tests/web.rs	100.0% <ø> (ø)
light-client-verifier/src/errors.rs	3.7% <ø> (ø)
...client-verifier/src/operations/commit_validator.rs	98.0% <ø> (ø)
light-client-verifier/src/operations/hasher.rs	100.0% <ø> (ø)
...ght-client-verifier/src/operations/voting_power.rs	98.0% <ø> (ø)
light-client-verifier/src/options.rs	0.0% <0.0%> (ø)
light-client-verifier/src/predicates.rs	97.4% <ø> (ø)
light-client-verifier/src/verifier.rs	87.9% <ø> (ø)
light-client/examples/light_client.rs	0.0% <0.0%> (ø)
... and 34 more

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[thanethomson]

I've submitted #1074 with some recommendations - what do you think?

If they make sense, I can do the same for your other PR tomorrow to backport those changes to v0.23.x.

[soareschen]

I've submitted #1074 with some recommendations - what do you think?

Looks good. Thanks!

I have also added re-export to the original paths that are exported by the tendermint-light-client crate.