Add new model

[olavis]

Tasks needed to successfully upload a model

Tasks

• Add model dialog #39
• Function to calculate size of input files #40
• Implement model upload #41
• Delete input files in model upload #42
• Implement file select for input files to upload new model #44
• Display INI file content #45
• Tests for new model upload #49
• Handle failed and loading state for file upload #82
• Transform uploaded model to RESQML (Backend)

Needs more investigation/Outside scope for MVP 🤔

• Image to visualise the model (NOT a real image for sectors)
• Load a remote model via direct URL/API
• Visualisation of the model