Add Union Testnet

[adairrr]

• Adds Union.
• Updates docs to include missing networks.
• Adds list_channels for use with union

Checklist

• Changelog updated.
• Docs updated.

[cloudflare-workers-and-pages]

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Latest commit:	8a64408
Status:	⚡️  Build in progress...

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 15 lines in your changes missing coverage. Please review.

Project coverage is 54.4%. Comparing base (3e528a8) to head (3030051).

Files	Patch %	Lines
cw-orch-daemon/src/queriers/ibc.rs	0.0%	14 Missing ⚠️
...terchain/interchain-daemon/src/packet_inspector.rs	0.0%	1 Missing ⚠️

Additional details and impacted files

Files	Coverage Δ
packages/cw-orch-networks/src/networks/mod.rs	0.0% <ø> (ø)
packages/interchain/interchain-core/src/types.rs	4.0% <ø> (ø)
...terchain/interchain-daemon/src/packet_inspector.rs	0.0% <0.0%> (ø)
cw-orch-daemon/src/queriers/ibc.rs	3.5% <0.0%> (-0.2%)	⬇️

... and 1 file with indirect coverage changes