Line name in hlines

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Hello there!

@DanielGoldfarb , first of all, I wanted to thank you for the work done. it is very pleasant to use your module in work.

I recently started looking into the matplotlib and mplfinance packages, so I often run into problems that get resolved pretty quickly (thanks google).

Unfortunately, I could not think of or find a solution to the following problem:
I am building a graph, on this graph I display n lines, I would like to name each of these lines, or indicate their value on the y-axis.

As a result, I really want to get something like this:

p.s. Sorry if there are errors somewhere in the text (I used google translate)

The issue names mplfinance and matplotlib but no source file, test, or entry point to start from. First inspect how mplfinance creates and exposes hlines, then define the supported way to label each line or show its y-axis value; done means the requested labels appear on the example chart and are covered by tests.

Written by the indexing model from the issue text.