scripts: Add cpp-name-format: pretty printer
scripts: Add cpp-name-format: pretty printer

Pretty-print cpp-names, useful for deciphering complex backtraces.

For example, the following line:
    service::storage_proxy::init_messaging_service()::{lambda(seastar::rpc::client_info const&, seastar::rpc::opt_time_point, std::vector<frozen_mutation, std::allocator<frozen_mutation> >, db::consistency_level, std::optional<tracing::trace_info>)#1}::operator()(seastar::rpc::client_info const&, seastar::rpc::opt_time_point, std::vector<frozen_mutation, std::allocator<frozen_mutation> >, db::consistency_level, std::optional<tracing::trace_info>) const at /local/home/bhalevy/dev/scylla/service/storage_proxy.cc:4360

Is formatted as:
    service::storage_proxy::init_messaging_service()::{
      lambda(
        seastar::rpc::client_info const&,
        seastar::rpc::opt_time_point,
        std::vector<
          frozen_mutation,
          std::allocator<frozen_mutation>
        >,
        db::consistency_level,
        std::optional<tracing::trace_info>
      )#1
    }::operator()(
      seastar::rpc::client_info const&,
      seastar::rpc::opt_time_point,
      std::vector<
        frozen_mutation,
        std::allocator<frozen_mutation>
      >,
      db::consistency_level,
      std::optional<tracing::trace_info>
    ) const at /local/home/bhalevy/dev/scylla/service/storage_proxy.cc:4360

Signed-off-by: Benny Halevy <23c997c90eb8537635e9392d48e7af1bf1b2ca22@scylladb.com>
Message-Id: <20191226142212.37260-1-23c997c90eb8537635e9392d48e7af1bf1b2ca22@scylladb.com>

scylladb/scylla,scylladb/scylla,avikivity/scylla,scylladb/scylla,avikivity/scylla,avikivity/scylla,scylladb/scylla