feat: make typegen factories an object instance

[nedsalk]

typegen factories currently are classes with static methods which is a problem when wanting to pass the whole factory as an argument because e.g. passing a whole TestContract__factory as an argument and using it in the manner of factoryArgument.deployContract would yield an undefined.deployContract error because TestContract__factory is not an object instance. This PR is necessary to be able to pass the outputs of typegen to launchTestNode in #1356. It doesn't break anything for end consumers.

[Torres-ssf]

@nedsalk Does the described issue with Typegen factories indicate a design flaw, or is this change primarily to fit the needs of launchTestNode?

[github-actions]

Coverage Report:

Lines	Branches	Functions	Statements
79.73%(+0%)	70.64%(-0.03%)	76.81%(-0.01%)	79.81%(+0%)

Changed Files:

Ok	File (✨=New File)	Lines	Branches	Functions	Statements
🔴	packages/account/src/account.ts	84.14% (+1.36%)	67.16% (+0.5%)	80.64% (+4.64%)	83.73% (+1.38%)
🔴	packages/account/src/providers/transaction-request/transaction-request.ts	87.32% (+1.41%)	77.63% (+2.63%)	86% (+0%)	87.67% (+1.37%)

[petertonysmith94]

I like this approach. Would it be worth having interfaces for these factories?

[nedsalk]

Does the described issue with Typegen factories indicate a design flaw, or is this change primarily to fit the needs of launchTestNode?

@Torres-ssf This change is primarily to fit the needs of launchTestNode. The design itself is okay as it follows ContractFactory. There is possibility for improvement here so that we don't need e.g. the contract as unknown as ContractAbi casts, but that's more related to the internal design of how we integrate typegen outputs with the rest of our codebase.

I like this approach. Would it be worth having interfaces for these factories?

@petertonysmith94 No because these factories themselves follow the interface of the ContractFactory class. Ideally we'd be returning a ContractFactory<TTypegenAbi> instance and we wouldn't have the need for this *__factory object, but this is related to what I told @Torres-ssf above - an internal design restructuring.