Shell scripts to calculate smart contract sizes

[arthurgousset]

Description

Sometimes it's useful to know the bytecode size of core contracts. This PR adds scripts calculate that in two ways:

1. Using the bytecode of actually deployed smart contracts.
2. Using the build artifacts of locally built smart contracts.

Writes the output to the console and to csv files in the scripts/bash/out/ directory (which is gitignored).

Changes

1. Adds two shell scripts
2. Adds commands to package.json
3. Adds documentation to README.md

Other changes

Nit: Linting in README.md file

Tested

• [x] Example run size:onchain

  $ yarn size:onchain
  
  # ...
  StableTokenEUR,0x434563B0604BE100F04B7Ae485BcafE3c9D8850E,9.180
  Validators,0xe52EaC18fB3C1e1713e73d4A5b7dCb12a2f2C697,58.228
  Data extraction complete. Results saved to /Users/arthur/Documents/celo-org/celo-monorepo/packages/protocol/out/onchain_bytecode_sizes_20240509_145556.csv
  ✨  Done in 19.15s.

• [x] Example run size:artifacts

  $ yarn size:artifacts
  
  # ...
  ReleaseGold,31.721
  OdisPaymentsProxy,2.868
  Data extraction complete. Results saved to /Users/arthur/Documents/celo-org/celo-monorepo/packages/protocol/scripts/bash/out/build_artefact_bytecode_sizes_20240509_151111.csv
  ✨  Done in 9.57s.

• [x] CSV output for both scripts looks good 👍

• [x] Output in out/ is gitignored

Related issues

• Fixes #10988

Backwards compatibility

Yes, backwards compatible. The new scripts can be used on-demand, but don't interfere with any existing flows.

Documentation

Yes, added documentation to the README.md file.