fix(api)!: increase_*_counters methods return Result type

[Farhad-Shabani]

Closes: #857

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PR author checklist:

• Added changelog entry, using unclog.
• Added tests.
• Linked to GitHub issue.
• Updated code comments and documentation (e.g., docs/).
• Tagged one reviewer who will be the one responsible for shepherding this PR.

Reviewer checklist:

• Reviewed Files changed in the GitHub PR explorer.
• Manually tested (in case integration/unit/mock tests are absent).

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.02% 🎉

Comparison is base (357f51d) 71.43% compared to head (b00da04) 71.46%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #858      +/-   ##
==========================================
+ Coverage   71.43%   71.46%   +0.02%     
==========================================
  Files         125      125              
  Lines       15181    15193      +12     
==========================================
+ Hits        10845    10857      +12     
  Misses       4336     4336              

Files Changed	Coverage Δ
crates/ibc/src/core/context.rs	50.00% <ø> (ø)
crates/ibc/src/core/ics02_client/error.rs	24.32% <ø> (ø)
crates/ibc/src/core/ics03_connection/error.rs	7.69% <ø> (ø)
crates/ibc/src/core/ics04_channel/error.rs	26.08% <ø> (ø)
...ibc/src/core/ics02_client/handler/create_client.rs	84.93% <100.00%> (-0.21%)	⬇️
...rc/core/ics03_connection/handler/conn_open_init.rs	97.29% <100.00%> (+0.02%)	⬆️
...src/core/ics03_connection/handler/conn_open_try.rs	93.71% <100.00%> (+0.03%)	⬆️
...c/src/core/ics04_channel/handler/chan_open_init.rs	94.31% <100.00%> (-0.13%)	⬇️
...bc/src/core/ics04_channel/handler/chan_open_try.rs	95.90% <100.00%> (-0.07%)	⬇️
crates/ibc/src/mock/context.rs	74.89% <100.00%> (+0.33%)	⬆️

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