Initialize the main branch

[thanethomson]

Partially addresses #1168.

This is a large PR because it involves reformatting all of the code on the v0.23.x branch, which will form the basis for the new main branch.

[codecov-commenter]

Codecov Report

Merging #1172 (d35e7e6) into main (590a038) will increase coverage by 0.0%.
The diff coverage is 93.2%.

@@          Coverage Diff          @@
##            main   #1172   +/-   ##
=====================================
  Coverage   67.5%   67.5%           
=====================================
  Files        214     214           
  Lines      20474   20480    +6     
=====================================
+ Hits       13828   13835    +7     
+ Misses      6646    6645    -1     

Impacted Files	Coverage Δ
abci/src/application.rs	18.0% <ø> (ø)
abci/src/application/kvstore.rs	74.4% <ø> (ø)
abci/src/client.rs	40.0% <ø> (ø)
abci/src/codec.rs	90.1% <ø> (ø)
abci/src/lib.rs	100.0% <ø> (ø)
abci/src/server.rs	9.4% <ø> (-0.1%)	⬇️
abci/tests/kvstore_app.rs	100.0% <ø> (ø)
config/src/config.rs	55.0% <0.0%> (ø)
config/src/error.rs	0.0% <ø> (ø)
config/src/net.rs	92.2% <ø> (ø)
... and 192 more

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