Revert "Conditional Codegen for Messages, Constructors and Events" PR

[SkymanOne]

This reverts #1458 as functionality is not working. Need to rethink the approach

This reverts commit 06e9cf2.

[codecov-commenter]

Codecov Report

Merging #1479 (f4b07f5) into master (6b24de9) will increase coverage by 22.88%.
The diff coverage is 85.71%.

@@             Coverage Diff             @@
##           master    #1479       +/-   ##
===========================================
+ Coverage   46.97%   69.85%   +22.88%     
===========================================
  Files         201      201               
  Lines        6210     6194       -16     
===========================================
+ Hits         2917     4327     +1410     
+ Misses       3293     1867     -1426     

Impacted Files	Coverage Δ
crates/ink/codegen/src/generator/dispatch.rs	94.54% <ø> (+94.54%)	⬆️
crates/ink/ir/src/ir/item_impl/mod.rs	90.67% <ø> (+26.33%)	⬆️
crates/ink/ir/src/ir/item_mod.rs	89.65% <66.66%> (+27.94%)	⬆️
crates/ink/codegen/src/generator/events.rs	97.26% <100.00%> (+97.26%)	⬆️
crates/ink/ir/src/ir/item_impl/iter.rs	100.00% <100.00%> (ø)
crates/engine/src/chain_extension.rs	19.04% <0.00%> (-23.81%)	⬇️
crates/env/src/engine/off_chain/types.rs	0.00% <0.00%> (-21.06%)	⬇️
crates/engine/src/test_api.rs	72.52% <0.00%> (-13.19%)	⬇️
crates/engine/src/ext.rs	55.05% <0.00%> (-12.93%)	⬇️
crates/env/src/engine/off_chain/impls.rs	36.47% <0.00%> (-11.18%)	⬇️
... and 51 more

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