Include total length for VODs

[mrtncode]

Required for home-assistant/core#169184

This PR adds total length for VODs. That is required for the core PR because we need the total length/ bytes to get the webkit streaming working.

The code is not perfect. But it works. Feel free to help me and/ or improve the code quality :)

[mrtncode]

@starkillerOG Can you take a look? :)

[starkillerOG]

Thanks for these efforts!
I am currently on a business trip abroad so I won't have acces to my dev PC for the comming 2 weeks, but when I am back I will take a look.

[mrtncode]

@starkillerOG Thanks for quick update!
I will improve and polish my PRs until you are back :)

[starkillerOG]

Are you using AI to assist you in writing code?
If so which AI?

[mrtncode]

Are you using AI to assist you in writing code? If so which AI?

I have used Copilot Assistance to to get the file size working. Its definetely not the cleanest code at the moment. I am thankful if you have some tips to improve it/ get file size more directly.
I decided to just do a minimal prototype to get it working and then focus on code quality. The problem is that webkit/ safari is very picky for media streaming and Apple hasnt released clear instructions for developers. Its more try and error :D

[mrtncode]

I will close this for now. It just makes everything too complicated. I think the better solution would be to improve the reolink proxying. In the reolink web ui VOD streaming is not a problem for apple devices.