feat(dpp): add bech32m address encoding for Platform addresses (DIP-0018)

[pauldelucia]

Issue being fixed or feature implemented

Implements DIP-0018 bech32m address encoding for Dash Platform payment addresses.

What was done?

• Added bech32 crate dependency to rs-dpp
• Added HRP constants: dashevo (mainnet), tdashevo (testnet/devnet/regtest)
• Added PlatformAddress methods:
  • hrp_for_network() - returns appropriate HRP for a network
  • to_bech32m_string() - encodes address as bech32m string
  • from_bech32m_string() - decodes bech32m string to address and network
• Implemented FromStr trait for parsing bech32m addresses
• Added comprehensive test coverage

How Has This Been Tested?

DET

Breaking Changes

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone

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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/dip18

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[github-actions]

✅ DashSDKFFI.xcframework built for this PR.

• Workflow run: https://github.com/dashpay/platform/actions/runs/20223084317
• Artifacts: DashSDKFFI.xcframework (folder), DashSDKFFI.xcframework.zip, xc_checksum.txt

SwiftPM (host the zip at a stable URL, then use):

.binaryTarget(
  name: "DashSDKFFI",
  url: "https://your.cdn.example/DashSDKFFI.xcframework.zip",
  checksum: "c568d40b7e790f5d7ca9f253c8531e8d1b9595153c1c45dd6538b2428a285950"
)

Xcode manual integration:

• Download 'DashSDKFFI.xcframework' artifact from the run link above.
• Drag it into your app target (Frameworks, Libraries & Embedded Content) and set Embed & Sign.
• If using the Swift wrapper package, point its binaryTarget to the xcframework location or add the package and place the xcframework at the expected path.