fix: current session may be invalid

[newraina]

Summary

Closes #2481

• remove invalid session from cache storage when receive expired error
• ignore expired sessions when SDK init. (also added isExpired method to Session class)

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
rooch-portal	🛑 Canceled (Inspect)			Aug 30, 2024 7:33am
rooch-portal-v2.1	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 30, 2024 7:33am

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| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **rooch** | ⬜️ Ignored ([Inspect](https://vercel.com/rooch/rooch/mBis7WrnDm9zwhMwzPe413bhJSfd)) | [Visit Preview](https://rooch-git-fork-newraina-2481-session-enhancement-rooch.vercel.app) | | Aug 30, 2024 7:33am |

[jolestar]

@wow-sven @jojoo-eth help to review

[wow-sven]

sdk test currently stuck. wait https://github.com/rooch-network/rooch/pull/2520 You can run tests locally