Remove Reader and Keeper API

[plafer]

Closes: #279

Description

One of my most productive days was throwing away 1,000 lines of code.

- Ken Thompson

[codecov]

Codecov Report

Base: 60.03% // Head: 69.45% // Increases project coverage by +9.42% 🎉

Coverage data is based on head (db9918e) compared to base (c6b5846).
Patch coverage: 72.22% of modified lines in pull request are covered.

❗ Current head db9918e differs from pull request most recent head 5904117. Consider uploading reports for the commit 5904117 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #456      +/-   ##
==========================================
+ Coverage   60.03%   69.45%   +9.42%     
==========================================
  Files         131      127       -4     
  Lines       18810    16257    -2553     
==========================================
  Hits        11292    11292              
+ Misses       7518     4965    -2553     

Impacted Files	Coverage Δ
crates/ibc/src/core/ics02_client/client_state.rs	75.00% <ø> (ø)
crates/ibc/src/core/ics02_client/handler.rs	0.00% <ø> (ø)
...ibc/src/core/ics02_client/handler/create_client.rs	80.59% <ø> (+30.12%)	⬆️
...bc/src/core/ics02_client/handler/upgrade_client.rs	87.07% <ø> (+27.26%)	⬆️
crates/ibc/src/core/ics03_connection/handler.rs	82.35% <ø> (+35.68%)	⬆️
...src/core/ics03_connection/handler/conn_open_ack.rs	95.78% <ø> (+29.11%)	⬆️
...core/ics03_connection/handler/conn_open_confirm.rs	97.87% <ø> (+27.10%)	⬆️
...rc/core/ics03_connection/handler/conn_open_init.rs	96.19% <ø> (+30.60%)	⬆️
...src/core/ics03_connection/handler/conn_open_try.rs	93.92% <ø> (+29.70%)	⬆️
crates/ibc/src/core/ics04_channel/context.rs	79.62% <ø> (+52.58%)	⬆️
... and 23 more

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[Farhad-Shabani]

Perfect 🙌

Just a few parts are left unused that don't seem to be needed...

[Farhad-Shabani]

🎉