fix solo machine as per ics spec changes

[colin-axner]

Description

Implements proposed ICS spec changes

NOTE: Timeouts are currently not supported as outlined in this issue

closes: #119

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Before we can merge this PR, please make sure that all the following items have been
checked off. If any of the checklist items are not applicable, please leave them but
write a little note why.

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer
• Review Codecov Report in the comment section below once CI passes

[codecov-commenter]

Codecov Report

Merging #153 (fb937b1) into main (2c880a2) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #153   +/-   ##
=======================================
  Coverage   79.17%   79.18%           
=======================================
  Files         109      109           
  Lines        6526     6528    +2     
=======================================
+ Hits         5167     5169    +2     
  Misses       1004     1004           
  Partials      355      355           

Impacted Files	Coverage Δ
...light-clients/06-solomachine/types/client_state.go	67.15% <100.00%> (+0.32%)	⬆️