[ReadHandler] Allow custom ReportScheduler Injection

[lpbeliveau-silabs]

Currently, we are choosing between unsynchronized and synchronized report scheduler by a define in CHIPConfig.h :
CHIP_CONFIG_SYNCHRONOUS_REPORTS_ENABLED

We could allow users to define their own scheduler by allowing injection from the app layer by passing a pointer to a reportscheduler implementaiton in the Server::Init()

[bzbarsky-apple]

We could allow users to define their own scheduler by allowing injection from the app layer

Uh... that is in fact what you have currently implemented, no? You can set any scheduler you want in the params passed to server init. I am very unclear as to what this issue is about @lpbeliveau-silabs .

[lpbeliveau-silabs]

While it was the case at some point during the merge of integration, it was removed on a request in the integration PR: #28104 (comment)

We currently offer the option between the Synchronized Scheduler and the default one from config, however it is not in ServerInitParams anymore.

A user would need to edit Server.cpp/.h to be able to change the scheduling logic.