Bump solc version to 0.8.23, update nix flake and update dependencies

[0xdavinchee]

How to review the PR:

• SuperfluidToken.sol uses new emit IERC20.Transfer and removes EventsEmitter library
• EventsEmitter lib removed
• Skim most files to see 0.8.19 => 0.8.23
• .sol files should not be interface
• foundry.toml files updated
• hardhat.config.ts files updated
• truffle.config.js files updated

closes #1530

[github-actions]

Changelog Reminder

Reminder to update the CHANGELOG.md for any of the modified packages in this PR.

• CHANGELOG.md modified
• Double check before merge

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (80099ac) 74.26% compared to head (ff4c979) 89.51%.

Additional details and impacted files

@@             Coverage Diff             @@
##              dev    #1783       +/-   ##
===========================================
+ Coverage   74.26%   89.51%   +15.25%     
===========================================
  Files         110      109        -1     
  Lines        5886     5885        -1     
  Branches      216      216               
===========================================
+ Hits         4371     5268      +897     
+ Misses       1463      565      -898     
  Partials       52       52               

Flag	Coverage Δ
ethereum-contracts	97.20% <100.00%> (+31.74%)	⬆️
sdk-core	82.40% <ø> (ø)

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[hellwolf]

@0xdavinchee let's wait until GDA rollouts?

[hellwolf]

Changelog update then we are fine.

[github-actions]

XKCD Comic Relif

Link: https://xkcd.com/1783