feat: add code-import plugin, start importing code in hardhat tooling section

[sarahschwartz]

• adds a plugin to support using a code-import component inside markdown files to import code snippets
• started replacing hard-coded code snippets in the tooling/hardhat section

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 0e90906):

https://zksync-docs-staging-5eb09--pr257-sarah-code-imports-on6gtbxp.web.app

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[github-actions[bot]]

:tada: This PR is included in version 1.43.0 :tada:

The release is available on GitHub release

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