feat(sdk-core): add taxara testnet to core

[BlockBruh]

PR Scope

Please title your PR according to the following types and scopes following conventional commits:

• fix(SDK name): will trigger a patch version
• chore(<type>): will not trigger any release and should be used for internal repo changes
• <type>(public): will trigger a patch version for non-code changes (e.g. README changes)
• feat(SDK name): will trigger a minor version
• feat(breaking): will trigger a major version for a breaking change

Description

[Summary of the change, motivation, and context]

How Has This Been Tested?

[e.g. Manually, E2E tests, unit tests, Storybook]

Are there any breaking changes?

[e.g. Type definitions, API definitions]

If there are breaking changes, please ensure you bump the major version Bump the major version (by using the title feat(breaking): ...), post a notice in #eng-sdks, and explicitly notify all Uniswap Labs consumers of the SDK.

(Optional) Feedback Focus

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(Optional) Follow Ups

[Things that weren't addressed in this PR, ways you plan to build on this work, or other ways this work could be extended]