These shortucuts allows to write shorter more straightforward code.
It allows to write:
```
clusters.InsertQuery(session).BindStruct(r).ExecRelease()
```
instead of:
```
tmt, names := clusters.Insert()
session.Query(stmt,names).BindStruct(r).ExecRelease()
```
Upstream merge
Add Session wrapper
With this patch we can now use gocqlx like:
```
session.Query(`SELECT * FROM struct_table`, nil).Get(&v)
```
instead of (old format):
```
gocqlx.Query(session.Query(`SELECT * FROM struct_table`), nil).Get(&v)
```
Signed-off-by: Michał Matczuk <michal@scylladb.com>
When table is used with SelectBuilder it triggers data race on Where()
condition usage.
This change copies underlining slices on table creation to allow safe
concurrent usage of the table.
