v3: add missing IPROTO feature flags to greeting negotiation

[bigbes]

Issue: Add missing IPROTO feature flags to greeting negotiation

The protocol features IPROTO_FEATURE_IS_SYNC and IPROTO_FEATURE_INSERT_ARROW have already been implemented, but their corresponding feature flags are missing from the greeting negotiation code.

Specifically, the following files need to be updated:

• go-tarantool/protocol.go— include the new features in the list of supported features during handshake.

These flags must be added so that the client correctly advertises support for these features during connection initialization.