Add implementation of GetLifiChains and GetLifiTokens endpoints - the…

[BellringerQuinn]

…se are useful to check which chains and tokens per chain are enabled by the new swap service provider, Lifi. Additionally, refactored PriceFeed.Token to a more generic class so it can be reused.

Version Increment

Please ensure you have incremented the package version in the package.json as necessary.

• I have incremented the package.json according to semantic versioning
• No version increment is needed; the change does not impact SDK or Sample code/assets

Docs Checklist

Please ensure you have addressed documentation updates if needed as part of this PR:

• I have created a separate PR on the sequence docs repository for documentation updates: Link to docs PR
• No documentation update is needed for this change. - while this is a new feature, the impact is likely to be minimal for most devs and I don't think we need to highlight its inclusion to devs; anyone who needs it should be able to discover it by looking at the interfaces they would already be using

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