tarantool / tarantool / 23248

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box: reduce box_process_lua Lua GC memory usage

<box_process_lua> function created a new GCfunc object for a handler
having no upvalues depending on the request context on each call.

The change introduces the following mapping:
| <handler id> -> <handler GCfunc object>
Initializing this mapping on Tarantool startup is aimed to reduce Lua GC
memory usage.

Reviewed-by: Sergey Ostanevich <sergos@tarantool.org>
Reviewed-by: Vladislav Shpilevoy <v.shpilevoy@tarantool.org>
Signed-off-by: Igor Munkin <imun@tarantool.org>

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