Optimize sparse query scorer dispatch

[lyang24]

This change templatizes the sparse query scorer to remove std::function indirection from the hot path

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[mergify]

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[mergify]

@lyang24 e2e jenkins job failed, comment /run-e2e can trigger the job again.

[alexanderguzhva]

@lyang24 does it significantly affect the performance?

[eyang-2]

@lyang24 does it significantly affect the performance?

no it helps a little bit by removing runtime looks ups in hot path, its a micro optimizaiton

[alexanderguzhva]

waiting for #1619

[alexanderguzhva]

@lyang24
please rebase to master. Thanks.