feat grpc: add more timing metrics buckets

This allows accounting for timings up to 120 seconds.
commit_hash:c875406a1a04ea4bb6de7be7eba3a0af63998d13

Author: UNEXPECTEDsemicolon

grpc/include/userver/ugrpc/impl/statistics.hpp

@@ -59,7 +59,7 @@ class MethodStatistics final {
     void MoveStartedTo(MethodStatistics& other) noexcept;
 
 private:
-    using Percentile = utils::statistics::Percentile<2000, std::uint32_t, 256, 100>;
+    using Percentile = utils::statistics::Percentile<2000, std::uint32_t, 1180, 100>;
     using Timings = utils::statistics::RecentPeriod<Percentile, Percentile>;
     using RateCounter = utils::statistics::RateCounter;