cratification: part II of the math commands to nu-cmd-extra

[stormasm]

The following math commands are being moved to nu-cmd-extra

• cos
• cosh
• egamma
• phi
• pi
• sin
• sinh
• tan
• tanh
• tau

For now I think we have most of the obvious commands moved over based on

@sholderbach this should cover moving the "high school" commands..

Yeah I think this rough separation into "high school" math in extra and "middle school"/"programmer" math in the core makes a ton of sense.

And to reference the @fdncred list from #9647 (comment)

[amtoine]

little note about that PR, it does not remove math egamma and math phi from core because these did not appear to be exported in the default context 🤔
now they are properly in the extra feature, thanks @stormasm 😊

[stormasm]

@amtoine yes, great point ! thanks for adding that to the comments 😄