Add side to grouped bar plugin, fix alignment with different sides

[gelicia]

This does not fix every axis/alignment scenario

• Adds an example with axes on the top, right, bottom and left. Each axes example has an example with the text being left or right aligned
• adds an optional ability to align text in the grouped bar plugin
• Adds logic to uplot where if the orientation is horizontal, it will align text to 0 or the chart width when the text is aligned left or right.

Left set of examples is before the change, right is after the change.

Related to grafana/grafana#94344

[gelicia]

I'm guessing 0 to canvas width is not the correct boundaries we want - what are the best offsets?

[leeoniya]

hey, thanks for this PR!

i took a slightly different approach in 63a9b4a