[countersyncd]: Init counter syncd module (sonic-net#3796)

What I did

This pull request introduces a new Rust-based application, countersyncd, designed for high-frequency telemetry data processing in SONiC environments. It also includes updates to the build pipeline to support the new application. The key changes are grouped into two themes: application implementation and build pipeline updates.

Application Implementation:
New Rust Application (countersyncd):
Added countersyncd as a new Rust application for processing telemetry data, including its main entry point (countersyncd/src/main.rs) and library modules for actors and messaging (countersyncd/src/lib.rs).
Defined actors (NetlinkActor, SwssActor, IpfixActor, and StatsReporterActor) and their communication channels for telemetry data processing.
Introduced command-line argument parsing using clap and logging configuration with env_logger.
Actor and Messaging Modules:
Added actor modules (netlink, ipfix, stats_reporter, and swss) for handling specific telemetry tasks.
Implemented messaging structures for inter-actor communication, including SocketBufferMessage, IPFixTemplatesMessage, and NetlinkCommand.
Build Pipeline Updates:
Pipeline Modifications:
Updated .azure-pipelines/build-template.yml to install and configure Redis for the build environment.
Added a step to run unit tests for countersyncd using cargo test.
Dependencies for countersyncd:
Defined dependencies in countersyncd/Cargo.toml, including libraries for async runtime (tokio), YAML parsing (yaml-rust), and logging (log, env_logger).
These changes collectively enable the development and integration of countersyncd into the SONiC platform while ensuring proper build and test support.

Why I did it

This module is required by the document: https://github.com/sonic-net/SONiC/blob/master/doc/high-frequency-telemetry/high-frequency-telemetry-hld.md

How I verified it

This PR includes the unittest for countersyncd, Check Azp status

Signed-off-by: Ze Gan <ganze718@gmail.com>

Author: Pterosaur

.azure-pipelines/build-template.yml

@@ -106,6 +106,12 @@ jobs:
         libdbus-1-dev \
         libteam-dev
       sudo pip3 install lcov_cobertura
+      sudo apt-get install -y redis-server
+      sudo sed -i 's/notify-keyspace-events ""/notify-keyspace-events AKE/' /etc/redis/redis.conf
+      sudo sed -ri 's/^# unixsocket/unixsocket/' /etc/redis/redis.conf
+      sudo sed -ri 's/^unixsocketperm .../unixsocketperm 777/' /etc/redis/redis.conf
+      sudo sed -ri 's/redis-server.sock/redis.sock/' /etc/redis/redis.conf
+      sudo service redis-server restart
     displayName: "Install dependencies"
   - task: DownloadPipelineArtifact@2
     inputs:
@@ -232,6 +238,9 @@ jobs:
       ./autogen.sh
       dpkg-buildpackage -us -uc -b -j$(nproc) && cp ../*.deb .
     displayName: "Compile sonic swss"
+  - script: |
+      cargo test
+    displayName: "Test countersyncd"
   - publish: $(System.DefaultWorkingDirectory)/
     artifact: ${{ parameters.artifact_name }}
     displayName: "Archive swss debian packages"