allocate memory for key and val in a single call

[arturmelanchyk]

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[k8s-ci-robot]

Hi @arturmelanchyk. Thanks for your PR.

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[ahrtr]

I do not see much value of such change. The motivation might be reducing the number of memory allocation, but the existing implementation is simpler & clearer, accordingly better readability.

[vtolstov]

why not use some buffer pool for such allocations ?