[appserver-io/appserver] Add missing method annotations to Interfaces

[pathmissing]

Updated: Missing methods in the following interfaces:

ApplicationInterface

• getDataDir()
• search()

HttpServletRequestInterface

• setAttribute()
• getUserPrincipal()
• logout()

HttpSessionInterface

• removeData()
• putData()
• hasKey()

[wagnert]

Can you please apply a more concrete description for the issue? Thanks

[pathmissing]

@wagnert Updated description with methods that are missing in commonly used interfaces.