* feat: add core workspace module (#145)

The core workspace module(WorkspaceService) is a foundational component
that enables the implementation of workspace features within OSD
plugins. The purpose of the core workspace module is to provide
a framework for workspace implementations.

This module does not implement specific workspace
functionality but provides the essential infrastructure for plugins to
extend and customize workspace features, it maintains a shared
workspace state(observables) across the entire application to ensure
a consistent and up-to-date view of workspace-related information to
all parts of the application.

Signed-off-by: Yulong Ruan <ruanyl@amazon.com>
Signed-off-by: Yulong Ruan <ruanyu1@gmail.com>
Co-authored-by: Miki <amoo_miki@yahoo.com>
(cherry picked from commit 9e3e3a7)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

# Conflicts:
#	CHANGELOG.md

Signed-off-by: Anan Zhuang <ananzh@amazon.com>

Fix lint

Signed-off-by: Miki <miki@amazon.com>

Signed-off-by: Miki <miki@amazon.com>