chore: move contract class struct to snapi

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• chore: move contract class struct to snapi #435 👈
• chore: remove redundent try_from methods for declare transaction #434 : 3 other dependent PRs (#433 , #436 , #451 )
• chore: organize methods such that public methods are at bottom #432
• main

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[codecov]

Codecov Report

Attention: Patch coverage is 92.90780% with 10 lines in your changes missing coverage. Please review.

Please upload report for BASE (arni/contract_class_refactor/remove_redundent_try_from_methods@2591105). Learn more about missing BASE report.

Files	Patch %	Lines
crates/starknet_api/src/contract_class.rs	92.92%	1 Missing and 7 partials ⚠️
crates/blockifier/src/execution/contract_class.rs	92.30%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@                                        Coverage Diff                                        @@
##             arni/contract_class_refactor/remove_redundent_try_from_methods     #435   +/-   ##
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  Coverage                                                                  ?   76.17%           
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  Files                                                                     ?      331           
  Lines                                                                     ?    35272           
  Branches                                                                  ?    35272           
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  Hits                                                                      ?    26867           
  Misses                                                                    ?     6110           
  Partials                                                                  ?     2295           

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