feat: decode ds-note events

[banteg]

What I did

Added support to decode different variants of ds-note events, commonly used across MakerDAO ecosystem.

Tested with:

• https://github.com/dapphub/ds-note/blob/master/src/note.sol
• https://github.com/makerdao/dss/blob/master/src/lib.sol
• https://github.com/makerdao/dss/blob/e2cdd97046d456b760c1223b5ffb86c540b9e096/src/vat.sol#L63

Related issue: #

How I did it

How to verify it

network.connect('mainnet')
tx = chain.get_transaction('0x7d5799a3622477847731d22ddd8d38031a949159446a727b3e4e7542ad558806')
tx.info()

Checklist

• I have confirmed that my PR passes all linting checks
• I have included test cases
• I have updated the documentation
• I have added an entry to the changelog

[iamdefinitelyahuman]

very cool