Contract api

[jawoznia]

Impl Extension trait on Contract. This change is required to generate entry_points without requiring user to specify which generics are for which messages.

Unfortunately rust compiler requires fully-qualified path and in current state it's not the most user friendly Api so the primary use case is code generation.

86

[codecov[bot]]

Codecov Report

Merging #248 (c653e88) into feat/generics_support (9d44792) will increase coverage by 1.14%. The diff coverage is 87.34%.

@@                    Coverage Diff                    @@
##           feat/generics_support     #248      +/-   ##
=========================================================
+ Coverage                  85.87%   87.02%   +1.14%     
=========================================================
  Files                         24       25       +1     
  Lines                       1657     1726      +69     
=========================================================
+ Hits                        1423     1502      +79     
+ Misses                       234      224      -10     

Files	Coverage Δ
sylvia-derive/src/input.rs	93.44% <100.00%> (+0.33%)	:arrow_up:
sylvia-derive/src/interfaces.rs	86.86% <100.00%> (ø)
sylvia-derive/src/message.rs	85.07% <100.00%> (+2.34%)	:arrow_up:
sylvia-derive/src/multitest.rs	97.23% <100.00%> (+0.93%)	:arrow_up:
sylvia-derive/src/remote.rs	100.00% <100.00%> (ø)
sylvia/src/types.rs	80.00% <ø> (ø)
sylvia/tests/api.rs	0.00% <0.00%> (ø)

... and 2 files with indirect coverage changes

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