feat!: upload to flamegraph.com

[eh-am]

Add another flag --uploadToPublicAPI that uploads to flamegraph.com

Example:

pyroscope-ci exec --uploadToPublicAPI --uploadToCloud=false -- go test ./... -count=1                                                             
ok      example/fib     16.034s                                                                                                                    
INFO[0017] Profiles have been uploaded to a public API:                                                                                            
INFO[0017]      myapp.alloc_space       https://flamegraph.com/share/e5c21989-b761-11ed-aad5-e25423ad2a59                                          
INFO[0017]      myapp.cpu       https://flamegraph.com/share/e5c1b256-b761-11ed-aad5-e25423ad2a59                                                  
INFO[0017]      myapp.goroutines        https://flamegraph.com/share/e5c1e0f1-b761-11ed-aad5-e25423ad2a59                                          
INFO[0017]      myapp.inuse_space       https://flamegraph.com/share/e5c1e914-b761-11ed-aad5-e25423ad2a59                                          
INFO[0017]      myapp.alloc_objects     https://flamegraph.com/share/e5c1a0b3-b761-11ed-aad5-e25423ad2a59                                          
INFO[0017]      myapp.inuse_objects     https://flamegraph.com/share/e5c218a0-b761-11ed-aad5-e25423ad2a59 

Also rename other flags:

--export   -> --exportLocally
--noUpload -> --uploadToCloud

[Rperry2174]

why doees it have both --uploadToPublicAPI and also --noUpload don't those contradict each other?

[eh-am]

--noUpload refers to uploading to the pyroscope cloud, it's enabled by default since that's the default case. it's unfortunate naming because it was assumed upload could >only< be to pyroscope cloud, if only we knew there would be other upload targets i would've called it differently :(

[Rperry2174]

Even though it's a breaking change I think we should:

1. Get rid of --noUpload (in favor of --uploadToCloud and --uploadToPublicAPI
2. rename --export to --exportLocally

That way everything is very explicit