tests: lwm2m: Add interoperability tests 222 - 281

Add remaining test cases from
Device management & Service Enablement Interface

* LightweightM2M-1.1-int-222 – Read on Object
* LightweightM2M-1.1-int-223 – Read on Object Instance
* LightweightM2M-1.1-int-224 – Read on Resource
* LightweightM2M-1.1-int-225 – Read on Resource Instance
* LightweightM2M-1.1-int-226 – Write (Partial Update) on
  Object Instance
* LightweightM2M-1.1-int-227 - Write (replace) on Resource
* LightweightM2M-1.1-int-228 - Write on Resource Instance
* LightweightM2M-1.1-int-229 - Read-Composite Operation
* LightweightM2M-1.1-int-230 - Write-Composite Operation
* LightweightM2M-1.1-int-231 - Querying basic information
  in SenML JSON format
* LightweightM2M-1.1-int-232 - Querying basic information
  in SenML CBOR format
* LightweightM2M-1.1-int-233 - Setting basic information
  in SenML CBOR format
* LightweightM2M-1.1-int-234 - Setting basic information
  in SenML JSON format
* LightweightM2M-1.1-int-235 - Read-Composite Operation on root path
* LightweightM2M-1.1-int-236 - Read-Composite - Partial Presence
* LightweightM2M-1.1-int-237 - Read on Object without specifying
  Content-Type
* LightweightM2M-1.1-int-241 - Executable Resource: Rebooting the device
* LightweightM2M-1.1-int-256 - Write Operation Failure
* LightweightM2M-1.1-int-257 - Write-Composite Operation
* LightweightM2M-1.1-int-260 - Discover Command
* LightweightM2M-1.1-int-261 - Write-Attribute Operation on a multiple
  resource
* LightweightM2M-1.1-int-280 - Successful Read-Composite Operation
* LightweightM2M-1.1-int-281 - Partially Successful Read-Composite
  Operation

Modify tests binary
* Allow CoAP payload of 1211 bytes.
* Allow outgoing messages to use block-wise if they are bigger.
* Use 4kB encode buffer for outgoing messages.
* Check configured heap and stack sizes.
* Limit number of interface addresses, sockets and contexts

Qemu-cortex-m3 platform ran out of RAM, so reconfigure it to use
* packet size of 256 bytes.
* encode buffer of 2kB
This exercises the block-transferring on some of the test cases.

Signed-off-by: Seppo Takalo <seppo.takalo@nordicsemi.no>