feat: add ibc source channel support

[CharlVS]

Summary

• support ibc_source_channel when creating withdraw requests
• expose ibcSourceChannel on WithdrawParameters
• pass the channel from the withdrawal screen example

Testing

• dart format -o none --set-exit-if-changed .
• flutter analyze --no-pub (fails: 1359 issues found)

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[github-actions]

Visit the preview URL for this PR (updated for commit 9bd8215):

https://komodo-defi-sdk--pr62-codex-verify-ibc-coi-7vjdqr3f.web.app

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[Copilot]

Pull Request Overview

This PR adds support for specifying an IBC source channel when creating withdrawal requests. Key changes include adding a new field (ibcSourceChannel) of type int to the withdrawal types, updating the withdrawal screen to capture and pass the IBC channel from user input, and propagating the new parameter through the RPC methods and request objects.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
packages/komodo_defi_types/lib/src/withdrawal/withdrawal_types.dart	New ibcSourceChannel field added to WithdrawParameters along with its JSON serialization and inclusion in the equality list.
packages/komodo_defi_sdk/example/lib/screens/withdrawal_page.dart	Withdrawal screen updated to parse and pass the IBC channel from user input, including setting the keyboard type to number.
packages/komodo_defi_rpc_methods/lib/src/rpc_methods/withdrawal/withdrawal_rpc_namespace.dart	The new ibcSourceChannel parameter is forwarded as part of the withdrawal methods.
packages/komodo_defi_rpc_methods/lib/src/rpc_methods/withdrawal/withdraw_request.dart	Changed the type of ibcSourceChannel from String? to int? and removed legacy migration comments.

Comments suppressed due to low confidence (2)

packages/komodo_defi_types/lib/src/withdrawal/withdrawal_types.dart:156

• Please add unit tests to verify that the new ibcSourceChannel field is correctly set and serialized.

this.ibcSourceChannel,

packages/komodo_defi_rpc_methods/lib/src/rpc_methods/withdrawal/withdraw_request.dart:52

• Review and remove legacy migration comments if they are no longer applicable, and update the documentation to clearly reflect that ibcSourceChannel is now an int.

//TODO! Migrate breaking changes when the ibc_source_channel is