Allow colorbars to attach to inset axes

[cvanelteren]

Closes #737
Colorbars requested on inset axes with side locations now stay attached to the inset instead of trying to allocate a subplot panel, which fails for axes without a subplot spec. The change remaps side requests to inset colorbar placements with side-appropriate default orientations and adds a regression test covering both direct inset-axis calls and figure-level calls that target an inset axis.

[cvanelteren]

Example

import numpy as np
import ultraplot as uplt

data = np.random.rand(10, 10)
x = 0.35
fig, ax = uplt.subplots()
inax = ax.inset_axes([0.55, 0.45, x, x])
inax.pcolormesh(
    data,
    colorbar="t",
    colorbar_kw=dict(width=0.85),
)

[codecov]

Codecov Report

❌ Patch coverage is 97.18310% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
ultraplot/axes/base.py	94.33%	1 Missing and 5 partials ⚠️

📢 Thoughts on this report? Let us know!

[gepcel]

I haven't had time to test this yet—don't let me hold up the process.

[cvanelteren]

There is no rush @gepcel

[cvanelteren]

I will merge it by Friday if I don't here anything fyi @gepcel if you have time before to test stuff then would love to get your feedback.

[gepcel]

If orientation is horizontal, I think the default should be "bottom".

[gepcel]

Because both ultraplot and matplotlib use bottom as default position for horizontal colorbar. Other than this, I'm ok with this.

[cvanelteren]

ah good catch will do that.

[gepcel]

You can merge when you think it's ready. This is an execellent feature.

[cvanelteren]

Thanks @gepcel