feat: Wrap impl types in `sv` module

[jawoznia]

part of #114

[codecov[bot]]

Codecov Report

Merging #246 (d6385b0) into feat/generics_support (e255585) will increase coverage by 0.02%. The diff coverage is 100.00%.

@@                    Coverage Diff                    @@
##           feat/generics_support     #246      +/-   ##
=========================================================
+ Coverage                  85.85%   85.87%   +0.02%     
=========================================================
  Files                         24       24              
  Lines                       1654     1657       +3     
=========================================================
+ Hits                        1420     1423       +3     
  Misses                       234      234              

Files	Coverage Δ
sylvia-derive/src/input.rs	93.10% <100.00%> (+0.12%)	:arrow_up:
sylvia/tests/custom_msg.rs	100.00% <ø> (ø)
sylvia/tests/custom_query.rs	92.00% <ø> (ø)
sylvia/tests/querier.rs	96.66% <100.00%> (+0.11%)	:arrow_up:

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