Add a button for dumping the metrics to a buffer about timecop

[billybonks]

I am happy to build this if we can agree on a format

currently i have been thinking about a csv split by headers.

Startup Time
window load time,213123
project load time,1232

Package Loading
package1,23ms
package2,25ms
package3,28ms

[phette23]

Just a little +1 to this. I noticed Atom was starting slow, but the only way for me to trace it to a particular package was to open up each & every single one until I found the one adding 2s to startup time. This package's utility is pretty minimal when you can't see an across-the-board summary of startup times.

@billybonks CSV format looks fine to me.

[billybonks]

@phette23 ye would be useful to have it automatically logged on startup, could then use a script to sum and average the values. i wouldn't have the headers for the automatic log.