[NGSI-LD] Test query language for NGSI-LD entities

[djs0109]

Test query language for get_entities endpoints.

official examples from spec v1.3.1

from section 4.9

# Example 1: Query checking if temperature is equal to 20
temperature_check = "temperature == 20"

# Example 2: Query checking if brand name is not "Mercedes"
brand_check = 'brandName != "Mercedes"'

# Example 3: Query checking if the parked status matches a specific identifier
is_parked_check = 'isParked == "urn:ngsi-ld:OffStreetParking:Downtown1"'

# Example 4: Query encoded as HTTP Query String with multiple conditions
http_query_example = "?q=speed > 50; brandName != Mercedes"

# Example 5: Query checking if entities have the attribute isMonitoredBy
is_monitored_check = "isMonitoredBy"

# Example 6: Complex query using logical OR and AND
complex_query_1 = "((speed > 50 | rpm > 3000); brandName == 'Mercedes')"

# Example 7: Query combining temperature range and capacity conditions with logical OR
complex_query_2 = "(temperature >= 20; temperature <= 25) | capacity <= 10"

# Example 8: Query for checking attribute path for observedAt time
observed_at_query = "temperature.observedAt >= '2017-12-24T12:00:00Z'"

# Example 9: Query for a specific city within a JSON structure in address property
city_query = 'address[city] == "Berlin"'

# Example 10: Query for a specific air quality particulate level in a nested JSON structure
particulate_query = "sensor.rawdata[airquality.particulate] == 40"

[djs0109]

@SystemsPurge could you take over this issue?