deps: Replace ethjs packages with @metamask/ forks

[legobeat]

• Replace ethjs with bn.js - it was only used for re-export
• ethjs-contract@^0.2.3 -> @metamask/ethjs-contract@^0.3.1
• ethjs-query@0.3.8 -> @metamask/ethjs-query@^0.5.0

[socket-security[bot]]

New and removed dependencies detected. Learn more about Socket for GitHub ↗︎

Packages	Version	New capabilities	Transitives	Size	Publisher
@metamask/ethjs-contract	0.3.4	environment	+3	1.3 MB
@metamask/ethjs-query	0.5.2	environment	+3	1.44 MB	lgbot
bn.js	4.12.0	None	+0	95.7 kB	fanatid

🚮 Removed packages: ethjs@0.4.0, ethjs-contract@0.2.3, ethjs-query@0.3.8

[socket-security[bot]]

👍 Dependency issues cleared. Learn more about Socket for GitHub ↗︎

This PR previously contained dependency changes with security issues that have been resolved, removed, or ignored.

Ignoring: @metamask/ethjs-contract@0.3.4

Next steps

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[legobeat]

@SocketSecurity ignore @metamask/ethjs-contract@0.3.4

[legobeat]

Looks good.

Thanks! RC: #116