[Email] Fetch Email through IMAP without concurrency and filter

[ShihChun-H]

Describe Your Proposed Tutorial

Issue Description

Current State

• Current code fetch Email through IMAP without concurrency and filter.

Why We Want to Change?

• We can fetch more emails without taking a longer time.

Proposed Change

• Find a better way to improve the performance of fetching email through IMAP.

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INS-6355 [Email] Fetch Email through IMAP without concurrency and filter

[donno2048]

I can work on this

[ShihChun-H]

Hi @donno2048 , the issue has been assigned to you. 🙌🏻

[kuroxx]

@chuang8511 @donch1989 Please help review the PR some time 🙏

[kuroxx]

GIven this comment: instill-ai/pipeline-backend#726 (comment)

So I will unassign first 🙏