Improve PanelWidgets with visible widget and make color deterministic

[hoxbro]

Also, memorizing the color when using groupby by using a dim expression instead of cycle.

screenrecord-2024-04-23_15.15.41.mp4

Code

import hvplot.pandas
import pandas as pd
from holonote.annotate import Annotator, SQLiteDB
from holonote.app import PanelWidgets
import panel as pn

# Setup
speed_data = pd.read_parquet("../assets/example.parquet")
curve = speed_data.hvplot("TIME", "SPEED")

annotator = Annotator(
    curve,
    fields=["category"],
    connector=SQLiteDB(table_name="styling"),
)

start_time = pd.date_range("2022-06-04", "2022-06-22", periods=5)
end_time = start_time + pd.Timedelta(days=2)
data = {
    "start_time": start_time,
    "end_time": end_time,
    "category": ["A", "B", "A", "C", "B"],
}
annotator.define_annotations(pd.DataFrame(data), TIME=("start_time", "end_time"))

# News stuff
annotator.groupby = "category"
pn.Row(PanelWidgets(annotator), annotator * curve)

[codspeed-hq]

CodSpeed Performance Report

Merging #100 will not alter performance

_{Comparing 1d_gui (74eefa9) with main (d9ec31e)}

Summary

✅ 6 untouched benchmarks

[hoxbro]

I will merge this and continue working on the 1D GUI in another PR.