feat: use channel with waitGroup to avoid too many goroutines

[Fleezesd]

What kind of this pr?

feat: Optimize CalcFloatDistance Function to Limit Concurrent Goroutines

Detailed Description

This PR introduces an enhancement to the CalcFloatDistance function by limiting the number of concurrent goroutines. The aim is to prevent excessive resource consumption and ensure efficient resource utilization. The changes include:

Utilizing runtime.NumCPU() * 2 to dynamically set the maximum number of concurrent goroutines, leveraging multi-core CPU capabilities.
Implementing a buffered channel guard to control the number of active goroutines.

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Fleezesd
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[sre-ci-robot]

Welcome @Fleezesd! It looks like this is your first PR to milvus-io/milvus 🎉

[mergify]

@Fleezesd Thanks for your contribution. Please submit with DCO, see the contributing guide https://github.com/milvus-io/milvus/blob/master/CONTRIBUTING.md#developer-certificate-of-origin-dco.

[mergify]

@Fleezesd Please associate the related issue to the body of your Pull Request. (eg. “issue: #”)