Large/Small Font options with MjrContext?

[rohit-kumar-j]

Too many changes in #23. So I want to ask this here (perhaps there are too many config options):
Add font options withinMjrContext?

viewer.__init__(font="small")  # or "large"

if font == "large":
   self.ctx = mujoco.MjrContext(
       self.model, mujoco.mjtFontScale.mjFONTSCALE_150.value)
elif font == "small":
    self.ctx = mujoco.MjrContext(
       self.model, mujoco.mjtFontScale.mjFONTSCALE_100.value)

Small	Large