feat: Support custom queries on contracts

[jawoznia]

First and second part of #201

[codecov[bot]]

Codecov Report

Merging #202 (fed9308) into custom_queries (92c6838) will increase coverage by 0.28%. The diff coverage is 100.00%.

@@                Coverage Diff                 @@
##           custom_queries     #202      +/-   ##
==================================================
+ Coverage           83.70%   83.98%   +0.28%     
==================================================
  Files                  23       24       +1     
  Lines                1172     1193      +21     
==================================================
+ Hits                  981     1002      +21     
  Misses                191      191              

Files Changed	Coverage Δ
sylvia/tests/custom_msg.rs	100.00% <ø> (ø)
sylvia/tests/messages_generation.rs	0.00% <ø> (ø)
sylvia-derive/src/input.rs	93.50% <100.00%> (+0.08%)	:arrow_up:
sylvia-derive/src/message.rs	84.14% <100.00%> (+0.12%)	:arrow_up:
sylvia-derive/src/multitest.rs	90.20% <100.00%> (+0.10%)	:arrow_up:
sylvia-derive/src/parser.rs	82.40% <100.00%> (+0.58%)	:arrow_up:
sylvia/tests/custom_query.rs	100.00% <100.00%> (ø)

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