feat(sdk-coin-tempo): add token transaction builder

[nvrakesh06]

TICKET: WIN-8479

[Copilot]

Pull request overview

This PR adds TIP-20 token transaction builder functionality to the Tempo SDK, enabling developers to construct and sign token transfer transactions on the Tempo blockchain with Account Abstraction support.

Key changes:

• Implements Tip20TransactionBuilder for creating single and batch TIP-20 token transfers with optional memo fields
• Adds viem integration for Ethereum-compatible address validation and transaction encoding
• Extends Tip20Token class with complete implementations of verifyCoin, getSendMethodArgs, getOperation, and queryAddressTokenBalance methods

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
yarn.lock	Adds viem@^2.21.0 and dependencies ([email protected], [email protected]) for Ethereum-compatible operations
modules/sdk-coin-tempo/package.json	Declares viem@^2.21.0 as a dependency
modules/sdk-coin-tempo/src/lib/constants.ts	Adds TIP-20 constants including 6-decimal precision, chain IDs, and AA transaction type (0x76)
modules/sdk-coin-tempo/src/lib/types.ts	Defines Tip20Operation interface for transfer operations with optional memo support
modules/sdk-coin-tempo/src/lib/utils.ts	Implements TIP-20 utility functions for amount conversion, memo encoding, and validation using viem
modules/sdk-coin-tempo/src/lib/tip20Abi.ts	Defines TIP-20 token ABI including transferWithMemo function signature
modules/sdk-coin-tempo/src/lib/transactionBuilder.ts	Implements transaction builder with fluent API for constructing TIP-20 transactions
modules/sdk-coin-tempo/src/lib/transaction.ts	Implements Tip20Transaction class representing AA transactions with batch operation support
modules/sdk-coin-tempo/src/lib/index.ts	Exports new types, builder, and transaction classes
modules/sdk-coin-tempo/src/tip20Token.ts	Completes token class implementation with actual validation and encoding logic
modules/sdk-coin-tempo/test/unit/utils.ts	Updates address validation test to use proper checksummed address
modules/sdk-coin-tempo/test/unit/transactionBuilder.ts	Adds comprehensive unit tests for builder, utilities, and validation
modules/sdk-coin-tempo/test/integration/tip20.ts	Adds integration test scaffolding for end-to-end transaction scenarios

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[MohammedRyaan786]

LGTM

[OttoAllmendinger]

@copilot to what extent do we use the viem library and can we use the existing ethereum dependencies instead?

[Copilot]

@OttoAllmendinger I've opened a new pull request, #7836, to work on those changes. Once the pull request is ready, I'll request review from you.

Dismissing the review to get this PR merged. I removed the new package addition and switched to using ethers.js instead.