[Typechain] modify the plugin to generate types for a subset of contracts

[ChristopherDedominici]

Describe the feature

In Hardhat v2, all contracts were compiled together each time, causing TypeChain to regenerate types for all contracts on every run.

In Hardhat v3, it is possible to compile only a subset of contracts. However, when doing so, the types folder is overwritten, retaining only the types from the compiled subset. As a result, types from previously compiled contracts are lost.

Can we prevent this? We should investigate how to generate types for a subset of contracts without deleting the existing types

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