x/auth: turn sign --validate-sigantures into a standalone command (#6108)

--validate-signatures should not be a flag of the sign command
as the operation performed (transaction signatures verification)
is logically distinct.

cli_test is and has always been an horrible name for package
directory as it's very much Go anti-idiomatic - _test is the
suffix used by test packages, not directories. Plus, CLI test
cases can and should live alongside other testcases that don't
require binaries to be built beforehand. Thus:

x/module/client/cli_test/*.go -> x/module/client/cli/

Test files that require sim{cli,d} shall be tagged with // +build cli_test

With regard to cli test auxiliary functions, they should live in:

x/module/client/testutil/

Co-authored-by: Alexander Bezobchuk <alexanderbez@users.noreply.github.com>

Makefile

@@ -2,7 +2,7 @@
 
 PACKAGES_NOSIMULATION=$(shell go list ./... | grep -v '/simulation')
 PACKAGES_SIMTEST=$(shell go list ./... | grep '/simulation')
-VERSION := $(shell echo $(shell git describe --tags) | sed 's/^v//')
+VERSION := $(shell echo $(shell git describe --tags --always) | sed 's/^v//')
 COMMIT := $(shell git log -1 --format='%H')
 LEDGER_ENABLED ?= true
 BINDIR ?= $(GOPATH)/bin
@@ -124,8 +124,7 @@ test-race:
 	@VERSION=$(VERSION) go test -mod=readonly -race $(PACKAGES_NOSIMULATION)
 
 test-integration: build-sim
-	BUILDDIR=$(BUILDDIR) go test -mod=readonly -p 4 `go list ./tests/cli/...` -tags=-tags='ledger test_ledger_mock cli_test'
-	BUILDDIR=$(BUILDDIR) go test -mod=readonly -p 4 `go list ./x/.../client/cli_test/...` -tags=-tags='ledger test_ledger_mock cli_test'
+	BUILDDIR=$(BUILDDIR) go test -mod=readonly -p 4 -tags=-tags='ledger test_ledger_mock cli_test' -run ^TestCLI `go list ./.../cli/...`
 
 .PHONY: test test-all test-ledger-mock test-ledger test-unit test-race
 
@@ -207,9 +206,8 @@ benchmark:
 ###############################################################################
 
 lint:
-	golangci-lint run
+	golangci-lint run --out-format=tab --issues-exit-code=0
 	find . -name '*.go' -type f -not -path "./vendor*" -not -path "*.git*" | xargs gofmt -d -s
-	go mod verify
 .PHONY: lint
 
 format: