enhance: Add WITH_DNNL build config for knowhere.

[mellonyou]

Have submit a PR to knowhere, which is using AMX to speed up Faiss Inner-Product. Add this build config so that AMX implementation can be opened in the milvus.
The default configuration in scripts/core_build.sh is OFF:
BUILD_WITH_DNNL="OFF"

Knowhere PR: zilliztech/knowhere#535

[sre-ci-robot]

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[mergify]

@mellonyou 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]

@mellonyou E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[mellonyou]

/run-cpu-e2e

[mergify]

@mellonyou E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.