chore: upgrade `pest` and enable parallel testing (#116)

Update composer.json

chore: update dependencies (#112)

chore: allow php 8 as a platform requirement (#111)

feat: implement Address#fromMultiSignatureAsset

feat: implement `PublicKey#fromMultiSignatureAsset` (#109)

chore: set up `graham-campbell/analyzer`

fix: return types of `AbstractTransactionBuilder`

fix: return type of the new method (#105)

fix: support signatory alias for message public key (#101)