[feature] instrument add-on discovery.

Currently the output from the initial build successful is not indicative of the time it took from starting the build to this point.

Screen Shot 2020-10-23 at 8 32 18 PM

It would be great to add instrumentation to the addon discovery to be able to get a more accurate representation of the total time it took to build.


Output from ember version --verbose && npm --version && yarn --version:

ember-cli: 3.17.0
node: 14.2.0
v8: 8.1.307.31-node.33
uv: 1.37.0
zlib: 1.2.11
brotli: 1.0.7
ares: 1.16.0
modules: 83
nghttp2: 1.40.0
napi: 6
llhttp: 2.0.4
openssl: 1.1.1g
cldr: 36.1
icu: 66.1
tz: 2019c
unicode: 13.0
os: darwin x64
6.14.4
1.22.4