Optimize http writer#10

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ReverseTM wants to merge 11 commits intotarantool:masterfrom

ReverseTM:optimize-http-writer

Commits on Jul 29, 2025

Replaced pongo2 with templates from standard library.
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Commits on Jul 30, 2025

Commits on Jul 31, 2025

Reworked format_template field, improved http writer performance
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Commits on Aug 5, 2025

Reduced the number of allocations
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