Updates for web3py v7.6. Includes version bump to v0.0.48

[slundqui]

This PR updates pypechain to work with web3py v7.6. Solves both #149 and #150. Includes version bump to v0.0.48.

Breaking Changes

• my_contract.events.MyEvent is no longer a type, but instead the instantiated object. This means calls to e.g., events.MyEvent().process_receipt_typed() will now be events.MyEvent.process_receipt_typed().

Major changes

• Changing handling of my_contract.events. Note overloaded events still are not implemented.
• Adding new pypechain class PypechainOverloadedFunctions that acts as a wrapper to the underlying overloaded functions.
• Delay calling the overloaded function factory until the arguments gets bound to the contract function.

Minor changes

• Pin web3py to v7.6 for futureproofing.
• Separate makefile builds to test and example.
• Using solidity compiler 0.8.24 for test gen.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 63.03318% with 156 lines in your changes missing coverage. Please review.

Project coverage is 74.07%. Comparing base (02d6973) to head (8b491e2).

Files with missing lines	Patch %	Lines
...in/test/structs/types/StructsA/StructsAContract.py	10.00%	27 Missing ⚠️
...in/test/structs/types/StructsB/StructsBContract.py	10.00%	18 Missing ⚠️
...in/test/structs/types/StructsC/StructsCContract.py	10.00%	18 Missing ⚠️
...urn_types/types/ReturnTypes/ReturnTypesContract.py	86.66%	16 Missing ⚠️
...ithStructArgs/ConstructorWithStructArgsContract.py	50.00%	15 Missing ⚠️
...pechain/test/events/types/Events/EventsContract.py	67.64%	11 Missing ⚠️
pypechain/utilities/format.py	23.07%	10 Missing ⚠️
...pes/ConstructorNoArgs/ConstructorNoArgsContract.py	60.00%	8 Missing ⚠️
...ConstructorWithArgs/ConstructorWithArgsContract.py	60.00%	8 Missing ⚠️
...yment/types/NoConstructor/NoConstructorContract.py	60.00%	8 Missing ⚠️
... and 7 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #151      +/-   ##
==========================================
- Coverage   75.50%   74.07%   -1.43%     
==========================================
  Files          80       80              
  Lines        3600     3830     +230     
==========================================
+ Hits         2718     2837     +119     
- Misses        882      993     +111     

Flag	Coverage Δ
unittests	74.07% <63.03%> (-1.43%)	⬇️

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[dpaiton]

very elegant solution! Great job