Oxygen evolution part 2

[esoteric-ephemera]

More analysis features for generating oxygen evolution graphs:

• Pull in thermo data from NIST JANAF tables + cache it
• Add stairstepping of O2 evolution data to make plotting easier in web

Sorry for another PR @tschaume, trying to isolate pieces of the pipeline. Also there's a lot of analysis stuff I had to add (pulling down web data + caching + spline evals) which likely doesn't belong in the API client but isn't going to be used elsewhere in our pipeline

Copy @minhsueh for thoughts

[esoteric-ephemera]

Also an example of how the plotting works with the new data structure:

from mp_api.client import MPRester
import plotly.graph_objects as pgo
import pandas as pd

with MPRester() as mpr:
    oxyevo = mpr.get_oxygen_evolution(
        "mp-1040954",
        "Ca",
    )

fig = pgo.Figure()
for formula, data in oxyevo.items():
    df = pd.DataFrame(data)
    df.reaction = df.reaction.apply(str)
    fig.add_trace(
        pgo.Scatter(
            x = df.temperature,
            y = df.evolution,
            name=formula,
            hovertext = df.reaction
        )
    )
fig.update_layout(
    xaxis = {
        "range": (-10.,1000),
        "title_text" : "T (K)",
    },
    yaxis_title_text = "O<sub>2</sub> evolved (per formula unit)",
    height=600,
    width=800,
)

[esoteric-ephemera]

New tests are passing locally on my side: https://github.com/esoteric-ephemera/mp_api/actions/runs/18327023900/job/52193848650