refactor!: move `tm2/keys/client` into `gno.land/pkg/keyscli` #2898

Job	Run time
build (1.20.x, GOARCH=amd64 GOOS=linux, gno)	20s
test (1.20.x, _test.cmd)	1m 10s
build (1.20.x, GOARCH=wasm GOOS=js, gno)	24s
test (1.20.x, _test.pkg)	41s
build (1.21.x, GOARCH=amd64 GOOS=linux, gno)	19s
test (1.20.x, _test.gnolang.native)	35s
build (1.21.x, GOARCH=wasm GOOS=js, gno)	22s
test (1.20.x, _test.gnolang.stdlibs)	55s
test (1.20.x, _test.gnolang.realm)	34s
test (1.20.x, _test.gnolang.pkg0)	1m 55s
test (1.20.x, _test.gnolang.pkg1)	6m 25s
test (1.20.x, _test.gnolang.pkg2)	4m 16s
test (1.20.x, _test.gnolang.other)	32s
test (1.21.x, _test.cmd)	1m 11s
test (1.21.x, _test.pkg)	45s
test (1.21.x, _test.gnolang.native)	30s
test (1.21.x, _test.gnolang.stdlibs)	52s
test (1.21.x, _test.gnolang.realm)	34s
test (1.21.x, _test.gnolang.pkg0)	1m 35s
test (1.21.x, _test.gnolang.pkg1)	6m 9s
test (1.21.x, _test.gnolang.pkg2)	4m 2s
test (1.21.x, _test.gnolang.other)	41s
upload-coverage	20s
	35m 7s

Provide feedback