add charts endpoints

[andersy005]

WIP

[andersy005]

@katamartin, this is ready for another round of review when you get a chance. https://offsets-db-staging.fly.dev/docs

❯ http 'https://offsets-db-staging.fly.dev/charts/project_registration'

[
    {
        "category": "industrial-gases",
        "end": 2020,
        "start": 2019,
        "value": 2
    },
    {
        "category": "forest",
        "end": null,
        "start": null,
        "value": 18
    },
    {
        "category": "industrial-gases",
        "end": 2022,
        "start": 2022,
        "value": 1
    },
    {
        "category": "forest",
        "end": 2022,
        "start": 2021,
        "value": 1
    },
    {
        "category": "industrial-gases",
        "end": null,
        "start": null,
        "value": 2
    },
    {
        "category": "renewable",
        "end": 2022,
        "start": 2022,
        "value": 3
    },
    {
        "category": "other",
        "end": null,
        "start": null,
        "value": 8
    },
    {
        "category": "renewable",
        "end": 2022,
        "start": 2021,
        "value": 2
    },
    {
        "category": "industrial-gases",
        "end": 2021,
        "start": 2020,
        "value": 2
    },
    {
        "category": "industrial-gases",
        "end": 2014,
        "start": 2014,
        "value": 1
    },
    {
        "category": "forest",
        "end": 2023,
        "start": 2022,
        "value": 1
    }
]

❯ http 'https://offsets-db-staging.fly.dev/charts/issuance_totals?num_bins=2'
[
    {
        "category": "industrial-gases",
        "end": 50205898.0,
        "start": 0.0,
        "value": 0.0
    },
    {
        "category": "forest",
        "end": null,
        "start": null,
        "value": 100411797.0
    },
    {
        "category": "forest",
        "end": 50205898.0,
        "start": 0.0,
        "value": 0.0
    },
    {
        "category": "other",
        "end": 50205898.0,
        "start": 0.0,
        "value": 0.0
    },
    {
        "category": "renewable",
        "end": 50205898.0,
        "start": 0.0,
        "value": 0.0
    }
]

[katamartin]

@andersy005 one behavior that's surprising and I think will be hard to implement a UI against is that the bin size is not regular. In the project_registration example above, why is the diff(end - start) sometimes 1 and sometimes 0?

[andersy005]

merging this so we can test against production deployment