Allow specification of custom artifact glob in @typechain/hardhat

[ckoopmann]

This PR allows the user to override the default glob pattern to limit the artifacts / contracts for which to generate types.

Also includes additional documentation on existing config parameters. Implements: https://github.com/dethcrypto/TypeChain/issues/730

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Latest commit: 84fa4202e30313211e97e5a77f75a5b82f37723d

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