[DRAFT] Zoom levels in Analysis

[Gautzilla]

🐳 Z🔎🔍M

This PR brings back the ability to export zoomed spectrograms to APLOSE.

It itends at being a bit more configurable than before:

🐬 User POV

From the user perspective, it would look like that:

analysis = Analysis(
    ...
    zoom_levels=[2,3,8], # List of desired zoom levels, which are no more necessarily powers of 2
    zoomed_ffts=None, # There are values by default but one could explicit the FFT used for each zoom level
)

dataset.run_analysis(analysis) # That's it

The default zoomed_ffts values would be, for a given zoom level z, a ShortTimeFFT instance that is the same as the given sft for the unzoomed specification (the one given as the fft parameter to the analysis), with its hop divided by z:

default_zoomed_sft = ShortTimeFFT(
   win=sft.win,
   hop=sft.hop // zoom_level,
   fs=sft.fs,
)

🐬 Exported data

Then, running the analysis with the specified zoom levels would export one SpectroDataset per zoom level, with the link between zoom analyses being specified in the dataset.json file:

{
    "datasets": {
        "original": {
            "analysis": "original",
            "class": "AudioDataset",
            "json": "data\\audio\\original\\original.json"
        },
        "cool_analysis_audio": {
            "analysis": "cool_analysis",
            "class": "AudioDataset",
            "json": "data\\audio\\cool_analysis_audio\\cool_analysis_audio.json"
        },
        "cool_analysis": {
            "analysis": "cool_analysis",
            "class": "SpectroDataset",
            "json": "processed\\cool_analysis\\cool_analysis.json",
            "zoom_level": 1,
            "zoom_reference": null
        },
        "cool_analysis_x2": {
            "analysis": "cool_analysis",
            "class": "SpectroDataset",
            "json": "processed\\cool_analysis_x2\\cool_analysis_x2.json",
            "zoom_level": 2,
            "zoom_reference": "cool_analysis"
        }
    },
    "depth": 0.0,
    "gps_coordinates": [
        0,
        0
    ],
    "instrument": null,
    "strptime_format": null,
    "timezone": null
}

Then, I'd add to the public API Dataset some methods to recover all zoomed datasets from the unzoomed version etc.

🐬 Note on AudioDatasets

As of now, I'm not sure there is a scenario in which exporting each "zoomed" audio split has any interest.

I think I'll just apply the zoom parameters to the spectral analysis, and in a scenario where the analysis includes AnalysisType.AUDIO (audio export), I'll only export the unzoomed AudioDataset and link all zoomed SpectroDatasets to this exported audio.