feat: Custom Token Import UI and BLoC

[takenagain]

Continuation of #176 by @naezith.

Modifications made since the original PR

• Migrated RPC functions to SDK (#22)
• Used SDK metadata storage to store custom tokens (#22)

custom_token_import_integration.mov

Some unlisted coins used for testing

• GOON - (Polygon): 0x433cDE5a82b5e0658dA3543b47A375dffd126Eb6
• PNIC (Avalanche): 0x4f3c5C53279536fFcfe8bCafb78E612E933D53c6
• SHIFU (ERC20): 0x2CC7A972ebC1865B346085655f929AbFa74CD4dC
• Everclear (ERC20): 0x58b9cB810A68a7f3e1E4f8Cb45D1B9B3c79705E8
• SYLVESTER (ERC20): 0xE0337B8835D9887e8B1294CEcBbDBcff7b299f41
• Hoodrat (ERC20): 0x62B6d83d5aFBf395ece55136E7161c119a8FD80C
• fWTIOIL (Fantom - no coingecko icon): 0xe297e06761a5489380538a0308b6f9b4a53bea45
• TemplarDAO (Moonriver): 0xD86E3F7B2Ff4e803f90c799D702955003bcA9875

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[github-actions]

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[CharlVS]

Awesome work. Please resolve the merge conflicts from the recently merged PR #2527.

As usual, please enable trailing commas, run dart fix --apply . && dart format ., and then commit changes to files/code modified in the PR.

[CharlVS]

Great work. Please change the height of the modal to be flexible based on the contents and eliminate this dead space. I'm assuming that is there because of the initial spec where we were expecting the user to provide the decimal count.

[CharlVS]

@takenagain Please also add the token contract addresses used for testing to the PR description.

[takenagain]

Great work. Please change the height of the modal to be flexible based on the contents and eliminate this dead space. I'm assuming that is there because of the initial spec where we were expecting the user to provide the decimal count.

I removed the dead space in 94d6be5 along with a fix to enable the network asset before fetching custom token info in e7f51dd.

I used the simple approach of adjusting the existing widget height properties, as there is still something requesting full vertical height in the dialog when removing the height property in the SizedBox widget.