/api/v2/nodes and streaming function (#15168)

* dummy streaming function

* expose global functions upstream

* separate function for pushing global functions

* add missing conditions

* allow streaming function to run async

* started internal API for functions

* cache host retention and expose it to /api/v2/nodes

* internal API for function table fields; more progress on streaming status

* abstracted and unified rrdhost status

* port old coverity warning fix - although it is not needed

* add ML information to rrdhost status

* add ML capability to streaming to signal the transmission of ML information; added ML information to host status

* protect host->receiver

* count metrics and instances per host

* exposed all inbound and outbound streaming

* fix for ML status and dependency of DATA_WITH_ML to INTERPOLATED, not IEEE754

* update ML dummy

* added all fields

* added streaming group by and cleaned up accepted values by cloud

* removed type

* Revert "removed type"

This reverts commit faae4177e603d4f85b7433f33f92ef3ccd23976e.

* added context to db summary

* new /api/v2/nodes schema

* added ML type

* change default function charts

* log to trace new capa

* add more debug

* removed debugging code

* retry on receive interrupted read; respect sender reconnect delay in all cases

* set disconnected host flag and manipulate localhost child count atomically, inside set/clear receiver

* fix infinite loop

* send_to_plugin() now has a spinlock to ensure that only 1 thread is writing to the plugin/child at the same time

* global cloud_status() call

* cloud should be a section, since it will contain error information

* put cloud capabilities into cloud

* aclk status in /api/v2 agents sections

* keep aclk_connection_counter

* updates on /api/v2/nodes

* final /api/v2/nodes and addition of /api/v2/nodes_instances

* parametrize all /api/v2/xxx output to control which info is outputed per endpoint

* always accept nodes selector

* st needs to be per instance, not per node

* fix merging of contexts; fix cups plugin priorities

* add after and before parameters to /api/v2/contexts/nodes/nodes_instances/q

* give each libuv worker a unique id

* aclk http_api_v2 version 4

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