Expose timeout option in z_get_options_t

[cguimaraes]

Describe the feature

Describe the feature

The timeout option (from rust: https://docs.rs/zenoh/0.7.0-rc/zenoh/query/struct.GetBuilder.html#method.timeout) should be exposed in zenoh-pico get options z_get_options_t.

[oteffahi]

The absence of a timeout option in zenoh-pico seems to cause a bug where an instance can hang forever if it performs a get and at least one queryable that received it never responds. Furthermore, the zenoh-pico instance hangs forever even if said queryable is exited.

Steps to reproduce (using 0.10.1-rc):

• Modify any z_queryable example to insert a sleep call between the reception of the get and sending the reponse. In my tests I use zenoh-python/z_queryable.py.
• Run the z_queryable example.
• Run the zenoh-pico/z_get example: zenoh-pico/z_get never times-out during the queryable's sleep call.
• Stop the z_queryable instance: zenoh-pico/z_get hangs forever.

[sashacmc]

@milyin please assign it to me