Add blst for BLS (#6539)

* Add blst third party dep

* initial build

* add init

* blst passing tests

* add feature flag

* blst and herumi for spec tests

* maybe this works for mac

* Actually set feature flag

* Add stub for VerifyMultipleSignatures for blst

* verifyCompressed

* use correct cores sizes

* aggregate public keys

* add multi-sig verification

* encode not hash

* revert back

* go mod tidy

* update blst to latest commit

* add batch decompress

* fix

* add test

* gofmt

* update blst

* go mod tidy

* remove kubesec, fix

* mod tidy

* disable some remote cache

* disable some remote cache

* disable some remote cache

* disable some remote cache

* Switch to -D__ADX__

* update

* tidy

* fix build

* Make blst for only linux,amd64

* gofmt

* lint

* lint

* gazelle

* fix build tag

* more stub methods

* shift adx instructions to x86

* fix arm64

* Revert "fix arm64"

This reverts commit 4d34ac21b7.

* add one more in

* Revert "Revert "fix arm64""

This reverts commit 1c8ae24ad1.

* try darwin now

* Revert "try darwin now"

This reverts commit 6f884714b8.

* Add sha256

* remove TODO

* checkpoint

* finally builds

* fix up

* add tag

* try again

* explicit disabling

* remove

* select properly

* fix

* better

* make CI happy too

* Update .bazelrc

* Update .bazelrc

* fix tests

* revert back

* Update shared/bls/blst/public_key.go

Co-authored-by: Victor Farazdagi <simple.square@gmail.com>

* Update shared/bls/blst/public_key.go

Co-authored-by: Victor Farazdagi <simple.square@gmail.com>

* clean up tests

* more clean up

* clean up

* add

* Update shared/bls/blst/signature.go

* Update shared/bls/blst/signature.go

* Update .buildkite-bazelrc

Co-authored-by: Preston Van Loon <preston@prysmaticlabs.com>

* try again

* remove go tag

* revert change

* gaz

* gazelle ignore

Co-authored-by: nisdas <nishdas93@gmail.com>
Co-authored-by: Victor Farazdagi <simple.square@gmail.com>
Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>

go.mod

@@ -96,6 +96,7 @@ require (
 	github.com/schollz/progressbar/v3 v3.3.4
 	github.com/sirupsen/logrus v1.6.0
 	github.com/status-im/keycard-go v0.0.0-20200402102358-957c09536969 // indirect
+	github.com/supranational/blst v0.1.2-alpha.1.0.20200828152217-d75dab4fb87d
 	github.com/tyler-smith/go-bip39 v1.0.2
 	github.com/urfave/cli/v2 v2.2.0
 	github.com/wealdtech/eth2-signer-api v1.3.0