FIX: Buf rate limited in CI

[julienrbrt]

We are getting rate limited by buf in CI:

error while running command /home/runner/go/bin/buf generate /tmp/TestCosmosGenScaffold2636387379/002/blog/proto --include-imports=true --include-wkt=true --error-format=json --log-format=json --template=/tmp/TestCosmosGenScaffold2636387379/002/blog/proto/buf.gen.ts.yaml --output=/tmp/TestCosmosGenScaffold2636387379/002/blog/ts-client/ibc.applications.interchain_accounts.controller.v1/types --path=/tmp/TestCosmosGenScaffold2636387379/002/blog/proto/blog/blog/module/v1/module.proto --path=/tmp/TestCosmosGenScaffold2636387379/002/blog/proto/blog/blog/v1/genesis.proto --path=/tmp/TestCosmosGenScaffold2636387379/002/blog/proto/blog/blog/v1/params.proto --path=/tmp/TestCosmosGenScaffold2636387379/002/blog/proto/blog/blog/v1/query.proto --path=/tmp/TestCosmosGenScaffold2636387379/002/blog/proto/blog/blog/v1/tx.proto --path=/tmp/TestCosmosGenScaffold2636387379/002/blog/proto/blog/withmsg/module/v1/module.proto --path=/tmp/TestCosmosGenScaffold2636387379/002/blog/proto/blog/withmsg/v1/genesis.proto --path=/tmp/TestCosmosGenScaffold2636387379/002/blog/proto/blog/withmsg/v1/params.proto --path=/tmp/TestCosmosGenScaffold2636387379/002/blog/proto/blog/withmsg/v1/query.proto --path=/tmp/TestCosmosGenScaffold2636387379/002/blog/proto/blog/withmsg/v1/tx.proto --path=/tmp/TestCosmosGenScaffold2636387379/002/blog/proto/blog/withoutmsg/module/v1/module.proto --path=/tmp/TestCosmosGenScaffold2636387379/002/blog/proto/blog/withoutmsg/v1/genesis.proto --path=/tmp/TestCosmosGenScaffold2636387379/002/blog/proto/blog/withoutmsg/v1/mytype.proto --path=/tmp/TestCosmosGenScaffold2636387379/002/blog/proto/blog/withoutmsg/v1/params.proto --path=/tmp/TestCosmosGenScaffold2636387379/002/blog/proto/blog/withoutmsg/v1/query.proto --path=/tmp/TestCosmosGenScaffold2636387379/002/blog/proto/blog/withoutmsg/v1/tx.proto: Failure: Unauthenticated remote plugin rate limit exceeded. For info on how to resolve this, visit: https://buf.build/b/auth-required

We should authenticate our requests and add a BUF_TOKEN in CI (cc @ilgooz)