feat(gre): add wallet methods

[tmigone]

Motivation

Sometimes when using GRE it's useful to get wallet(s) derived from the mnemonic specified on the network config. This can easily be made using ethers and Wallet but including the functionality in GRE allows to later compose it with #696 which is a lot more useful.

This is particularly useful when running hardhat tasks that make use of cli commands, as the CLI env expects a wallet and not a signer connected to a provider (which is what the GRE works with).

Changes

Added two methods to GRE:

• getWallets will return an array with 20 wallets derived from the mnemonic specified on the network config
• getWallet will return a wallet derived from the same mnemonic. If it's not on the derivation path it returns undefined.

Signed-off-by: Tomás Migone tomas@edgeandnode.com

[codecov]

Codecov Report

Base: 90.57% // Head: 90.57% // No change to project coverage 👍

Coverage data is based on head (9b91113) compared to base (af17480).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
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  Coverage   90.57%   90.57%           
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  Files          35       35           
  Lines        1762     1762           
  Branches      296      296           
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  Hits         1596     1596           
  Misses        166      166           

Flag	Coverage Δ
unittests	90.57% <ø> (ø)

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