[SampleReader][cleanups] Separate Get/Set stream id methods

[CastagnaIT]

Description

Separate Get/Set stream id methods
so that its possible set streamid without use the factory

Motivation and context

on the future drm rework for the drm autoselection im moving this code

inputstream.adaptive/src/main.cpp

Lines 246 to 257 in 397a0c1

	stream->m_adStream.start_stream(m_lastPts);
	stream->SetAdByteStream(std::make_unique<CAdaptiveByteStream>(&stream->m_adStream));
	ContainerType reprContainerType = rep->GetContainerType();
	uint32_t mask = (1U << stream->m_info.GetStreamType()) | m_session->GetIncludedStreamMask();
	auto reader = ADP::CreateStreamReader(reprContainerType, stream, static_cast<uint32_t>(streamid), mask);
	if (!reader)
	{
	m_session->EnableStream(stream, false);
	return false;
	}

in to Session::PrepareStream (PrepareStream method will be used to initialize drm for all types of manifests)

this is required because currently there is CFragmentedSampleReader that needs reader->SetDecrypter
on the rework code GetSingleSampleDecryptor/GetDecrypterCaps dont exists anymore
and i need to get them by using session id that on main.cpp on new code cannot be achieved without adding additional methods which in my opinion are not necessary

along this change i changed all vars types by using int everywhere, since kodi interface use int only

How has this been tested?

Screenshots (if appropriate):

Types of change

• Bug fix (non-breaking change which fixes an issue)
• Clean up (non-breaking change which removes non-working, unmaintained functionality)
• Improvement (non-breaking change which improves existing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that will cause existing functionality to change)
• Cosmetic change (non-breaking change that doesn't touch code)
• None of the above (please explain below)

Checklist:

• I have read the Contributing document
• My code follows the Code Guidelines of this project
• My change requires a change to the Wiki documentation
• I have updated the documentation accordingly