[feat] better image sequence node

[melMass]

Describe the problem

Since VHS came out I did not work much on any I/O things, but Load Image Sequence still has use cases not covered by VHS.

Describe the solution you'd like

• [ ] better UX (it should be possible to select a whole folder and not specify the template name like currently)
• [ ] support for varying dimensions (as mentioned by @curlysasha in #51), we don't have the limitations of batches, this does have applications.

Alternatives considered

No response

Additional context

No response

[curlysasha]

I don’t know what exactly the problems in VHS are, but I noticed errors in the following cases: a very large picture, pictures of different sizes in the batch (list?), image size is not a multiple of 2

Sequence node from mtb not react to frame number with correct file names

Load images from inspire pack working good