Add femver to the SDK

[Jordan-Mysten]

This adds femver, which is a lightweight alternative to semver. Right now it just is used for parsing, but the idea is that this is a better way to do version checks in the SDK. This gives us access to functions like lt and gt which will let us easily express version checks in the SDK. Right now we don't have much version-gated functionality, but when we do I think this will make it a lot easier.

I verified the bundle size was hardly impacted by the inclusion, so I think this makes sense to add.

[github-actions[bot]]

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[github-actions[bot]]

💳 Wallet Extension has been built, you can download the packaged extension here: https://github.com/MystenLabs/sui/actions/runs/3525660331#artifacts