feat: near intents plasma support

[gomesalexandre]

Description

Add Plasma as a supported chain for NEAR Intents swapper.

Issue (if applicable)

Risk

Low - Plasma uses existing EVM infrastructure, and NEAR Intents API handles it correctly.

What protocols, transaction types, wallets or contract interactions might be affected by this PR?

NEAR Intents swaps involving Plasma.

Testing

Engineering

Test Plasma swaps via NEAR Intents with supported assets (XPL native, USDT).

NOTE: USDT on Plasma is theoretically supported as per API, but currently broken upstream, not able to trade it, so only XPL should be tested here.

Operations

• 🏁 My feature is behind a flag and doesn't require operations testing (yet)

Screenshots (if applicable)

https://jam.dev/c/09c46a42-80e0-49d2-9b39-7b92b9063383

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat_near_plasma

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