[ethers deps] Use ethers subpackages fix unused ts import

[iainnash]

This uses ethers sub-packages in order to reduce bundle sizes across generated code in ethers-v5 packages. (see #771)

It also fixes #721 by changing the method that imports are handled for the common package to check if the symbol is used first in the source parameter.

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Latest commit: 24d5631fa2c5b337d45098cfc1913ee324342188

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