[Enhancement] Customise change rank in plot params

[RussellSB]

Further expand on change rank customisation options visually - through plot params in develop by

• Adding ability to toggle it off or on (skip it for plots). I.e. numbers do not get shown at all for any segments.
• Custom font size, allowing user to set to even larger to help readability if they'd like.
• Custom y-axis location. E.g. right now top by default. Can set to centre or bottom of trend segment. I'm happy to constrain horizontal alignment to centre of segment since I think that's sensible.
• Control on change rank display. At the moment change rank only plots for real Up/Down trend segments. Add a param to also allow to plot for all (including also Flat & Noise). This could be useful for debugging, or just general user preference.

[RussellSB]

Hey @Sanjays2402 might you be interested in picking this up?

Appreciate the speed and effectiveness of your last PR. Just had this idea and it is related to the area of code you just familiarised yourself with.