capitalize() function

[xIceFox]

Is your feature request related to a problem? Please describe.
We are sometimes using capitalization for strings in bicep and I was always wondering, why there is no capitalize() function.
Currently (via bicep console):

var test = 'test'
var capitalized = '${toUpper(substring(test, 0, 1))}${substring(test, 1)}'
capitalized
'Test'

Describe the solution you'd like
A dedicated capitalize() function

[stephaniezyen]

Is there a specific use case you would be hoping to use this for?

[xIceFox]

I know that this will not be the top priority feature. It is just helpful in some situations where you set the name to something capitalized. For example a tag or something human readable such as a display name.
Currently you can just define a user defined function for that, but I had a feeling that this should be native to bicep to complete the string casing functions. Still there are workarounds for that.