[refactor]: Remove adt_const_generics nightly feature

[mversic]

Signed-off-by: Marin Veršić marin.versic101@gmail.com

Description of the Change

Relevant discussion
If many of you disagree we'll reject this PR

Issue

Benefits

Possible Drawbacks

Usage Examples or Tests [optional]

Alternate Designs [optional]

[codecov]

Codecov Report

Merging #3104 (7501e91) into iroha2-dev (a4d5c9f) will increase coverage by 2.81%.
The diff coverage is 71.44%.

@@              Coverage Diff               @@
##           iroha2-dev    #3104      +/-   ##
==============================================
+ Coverage       62.33%   65.14%   +2.81%     
==============================================
  Files             169      171       +2     
  Lines           31218    33564    +2346     
==============================================
+ Hits            19459    21866    +2407     
+ Misses          11759    11698      -61     

Impacted Files	Coverage Δ
cli/src/main.rs	1.09% <0.00%> (ø)
cli/src/torii/mod.rs	27.65% <ø> (ø)
cli/src/torii/utils.rs	72.00% <0.00%> (-12.85%)	⬇️
client_cli/src/main.rs	0.24% <0.00%> (-0.01%)	⬇️
config/base/src/lib.rs	91.57% <ø> (+55.21%)	⬆️
config/src/lib.rs	33.33% <ø> (ø)
config/src/logger.rs	70.21% <ø> (ø)
config/src/path.rs	0.00% <0.00%> (ø)
core/src/lib.rs	100.00% <ø> (ø)
core/src/smartcontracts/isi/block.rs	85.71% <ø> (-3.18%)	⬇️
... and 171 more

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[Erigara]

Looks good to me.

I find approach with enum to be too verbose + const generics enums don't seems to be stabilized soon.

[appetrosyan]

I'm not a huge fan of moving away, but given that the feature is marked as incomplete even though it should not break in any context the fact that this would let people use a stable compiler might be worth the trade-off in terms of readability.