BE: Add mutation APIs for workspace ports

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MR: Pending

Description

As a pre-requisite to enable management of ports through a VSCode extension from within a workspace we want to introduce the following mutations:

1. Mutation for creating a new workspace_ports record
2. Mutation for removing an existing record

Acceptance Criteria

• Add new create/remove APIs for workspace ports
• Add a new field in the WorkspaceCreate mutation to return workspace ports
• New mutations mounted in ee/app/graphql/ee/types/mutation_type.rb
• Add remote development domain logic modules to handle mutation requests
• Add new policy for workspace ports to allow create/delete with workspace level authorization rules
• GraphQL docs updated
• Add unit tests for each new class
• Update remote_development integration_spec.rb to test the new mutations

Technical Requirement

GraphQL changes

• Mutation.workspaceCreate

  	name	type
  field	workspacePorts	[WorkspacePort!]

• Mutation.workspaceAddPort:

  	name	type
  argument	portNumber	Int
  argument	workspaceId	GlobalIDType[::RemoteDevelopment::Workspace]
  field	workspacePort	WorkspacePort

  All ports added with this mutation should have port_type set as user_defined

• Mutation.workspaceRemovePort:

  	name	type
  argument	portNumber	Int
  argument	workspaceId	GlobalIDType[::RemoteDevelopment::Workspace]

  Only user_defined ports should be removed with this mutation

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Authorization Policy

• Policy should have workspace level authorization rules