Support --home argument

[rootwarp]

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By default, this CLI application uses $HOME/.eigenlayer directory as a home so keys are stored under this directory.
But in some operators who would like to manage their keys explicitly,
using the hidden directory could be the choice to be avoided.

To resolve this issue, many CLI tools (like Cosmos SDK) support --home argument to support user's variable tastes.

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Support --home argument for all CLI subcommand.
If a user does not use --home argument, the CLI should work like the current behavior.

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