[host] add network properties class

[Irving-cl]

This PR adds a new interface NetworkProperties to provide a unified, synchronized way to access network properties for both NCP and RCP.

• For RCP, the property getters are implemented by OT APIs with an OT instance.
• For NCP, the property getters are implemented by the replica of the data that comes from NCP.

This is important for adding NCP support because in some cases the network properties are required by some functionality and we don't want to make an asynchronous call simply to get the property. As one example, in AdvertisingProxy, we need to the MeshLocal Prefix to check if an address is mesh local address. Currently this is done by OT API, which is not available under NCP mode. However, the information is contained in the active dataset and NCP will always notify the host about the change. With NetworkProperties, we can always get these properties in a synchronized way.

This PR also replaces a few usage of otThreadGetDeviceRole by NetworkProperties. In this way we will gradually remove the direct usage of OT APIs and mInstance in ot-br-posix modules. In this way we can develop for both NCP&RCP more easily.

[codecov]

Codecov Report

Attention: Patch coverage is 60.60606% with 13 lines in your changes missing coverage. Please review.

Project coverage is 45.37%. Comparing base (2b41187) to head (51e700e).
Report is 734 commits behind head on main.

Files	Patch %	Lines
src/ncp/ncp_host.cpp	42.85%	4 Missing ⚠️
src/ncp/ncp_spinel.cpp	57.14%	3 Missing ⚠️
src/dbus/server/dbus_thread_object_ncp.cpp	0.00%	2 Missing ⚠️
src/utils/thread_helper.cpp	50.00%	2 Missing ⚠️
src/ncp/ncp_spinel.hpp	0.00%	1 Missing ⚠️
src/ncp/rcp_host.cpp	90.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2387       +/-   ##
===========================================
- Coverage   55.77%   45.37%   -10.41%     
===========================================
  Files          87       94        +7     
  Lines        6890    10590     +3700     
  Branches        0      769      +769     
===========================================
+ Hits         3843     4805      +962     
- Misses       3047     5546     +2499     
- Partials        0      239      +239     

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[superwhd]

With NetworkProperties, we can always get these properties in a synchronized way.

The idea is to maintain a cache of the properties at the host (by receiving updates from the callbacks). Right?

I think 'synchronized' may not be accurate here.

[superwhd]

LGTM 👍

[zhanglongxia]

LGTM

[abtink]

Looks great. Thanks @Irving-cl.

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