Refactoring VMware Integration and Implementing AWS Support (#44)

* Initailize aws support

* Add README for the VM server

* Refactor OSWorld for supporting more cloud services.

* Initialize vmware and aws implementation v1, waiting for verification

* Initlize files for azure, gcp and virtualbox support

* Debug on the VMware provider

* Fix on aws interface mapping

* Fix instance type

* Refactor

* Clean

* hk region; debug

* Fix lock

* Remove print

* Remove key_name requirements when allocating aws vm

* Clean README

---------

Co-authored-by: XinyuanWangCS <xywang626@gmail.com>

desktop_env/providers/base.py

@@ -0,0 +1,89 @@
+from abc import ABC, abstractmethod
+
+
+class Provider(ABC):
+    def __init__(self, region: str = None):
+        """
+        Region of the cloud service.
+        """
+        self.region = region
+
+    @abstractmethod
+    def start_emulator(self, path_to_vm: str, headless: bool):
+        """
+        Method to start the emulator.
+        """
+        pass
+
+    @abstractmethod
+    def get_ip_address(self, path_to_vm: str) -> str:
+        """
+        Method to get the private IP address of the VM. Private IP means inside the VPC.
+        """
+        pass
+
+    @abstractmethod
+    def save_state(self, path_to_vm: str, snapshot_name: str):
+        """
+        Method to save the state of the VM.
+        """
+        pass
+
+    @abstractmethod
+    def revert_to_snapshot(self, path_to_vm: str, snapshot_name: str) -> str:
+        """
+        Method to revert the VM to a given snapshot.
+        """
+        pass
+
+    @abstractmethod
+    def stop_emulator(self, path_to_vm: str):
+        """
+        Method to stop the emulator.
+        """
+        pass
+
+
+class VMManager(ABC):
+
+    @abstractmethod
+    def initialize_registry(self, **kwargs):
+        """
+        Initialize registry.
+        """
+        pass
+
+    @abstractmethod
+    def add_vm(self, vm_path, **kwargs):
+        """
+        Add the path of new VM to the registration.
+        """
+        pass
+
+    @abstractmethod
+    def occupy_vm(self, vm_path, pid, **kwargs):
+        """
+        Mark the path of VM occupied by the pid.
+        """
+        pass
+
+    @abstractmethod
+    def list_free_vms(self, **kwargs):
+        """
+        List the paths of VM that are free to use allocated.
+        """
+        pass
+
+    @abstractmethod
+    def check_and_clean(self, **kwargs):
+        """
+        Check the registration list, and remove the paths of VM that are not in use.
+        """
+        pass
+
+    @abstractmethod
+    def get_vm_path(self, **kwargs):
+        """
+        Get a virtual machine that is not occupied, generate a new one if no free VM.
+        """
+        pass