Create a lint CI job

[DifferentialOrange]

Check Go code with some gofmt action (for example, https://github.com/golangci/golangci-lint-action) and Lua code with luacheck

[ligurio]

Full list of warnings produced by golangci-lint (golangci-lint run .):

schema.go:54:19: illegal character U+0023 '#' (typecheck)
	spaceSpId  = 280 # disable the rule SA1000
	                 ^
schema.go:61:2: expected 'IDENT', found 'var' (typecheck)
	var resp *Response
	^
schema.go:69:2: expected 'IDENT', found 'if' (typecheck)
	if err != nil {
	^
schema.go:70:3: expected 'IDENT', found 'return' (typecheck)
		return err
		^
schema.go:71:2: expected 'IDENT', found '}' (typecheck)
	}
	^
schema.go:72:2: expected 'IDENT', found 'for' (typecheck)
	for _, row := range resp.Data {
	^
schema.go:79:3: expected 'IDENT', found 'if' (typecheck)
		if len(row) >= 6 {
		^
schema.go:80:4: expected 'IDENT', found 'switch' (typecheck)
			switch row5 := row[5].(type) {
			^
schema.go:84:5: expected declaration, found 'if' (typecheck)
				if temp, ok := row5["temporary"]; ok {
				^
schema.go:131:22: expected 'IDENT', found ')' (typecheck)
		switch row[4].(type) {
		                   ^
schema.go:132:14: expected ';', found ':' (typecheck)
		case uint64:
		           ^
example_test.go:19:26: undeclared name: `tarantool` (typecheck)
func example_connect() (*tarantool.Connection, error) {
                         ^
tarantool_test.go:92:12: undeclared name: `Opts` (typecheck)
var opts = Opts{
           ^
example_test.go:20:15: undeclared name: `tarantool` (typecheck)
	conn, err := tarantool.Connect(server, opts)
	             ^
example_test.go:38:12: undeclared name: `tarantool` (typecheck)
	var conn *tarantool.Connection
	          ^
tarantool_test.go:105:15: undeclared name: `Connect` (typecheck)
	conn, err := Connect(server, opts)
	             ^
tarantool_test.go:118:48: undeclared name: `IterEq` (typecheck)
		_, err = conn.Select(spaceNo, indexNo, 0, 1, IterEq, []interface{}{uint(1111)})
		                                             ^
tarantool_test.go:128:15: undeclared name: `Connect` (typecheck)
	conn, err := Connect(server, opts)
	             ^
tarantool_test.go:142:50: undeclared name: `IterEq` (typecheck)
		err = conn.SelectTyped(spaceNo, indexNo, 0, 1, IterEq, IntKey{1111}, &r)
		                                               ^
tarantool_test.go:152:15: undeclared name: `Connect` (typecheck)
	conn, err := Connect(server, opts)
	             ^
tarantool_test.go:165:14: undeclared name: `Future` (typecheck)
		var fs [N]*Future
		           ^
tarantool_test.go:167:53: undeclared name: `IterEq` (typecheck)
			fs[j] = conn.SelectAsync(spaceNo, indexNo, 0, 1, IterEq, []interface{}{uint(1111)})
			                                                 ^
tarantool_test.go:195:14: undeclared name: `Future` (typecheck)
		var fs [N]*Future
		           ^
tarantool_test.go:230:15: undeclared name: `Future` (typecheck)
			var fs [N]*Future
			           ^
tarantool_test.go:391:12: undeclared name: `Response` (typecheck)
	var resp *Response
	          ^
tarantool_test.go:393:12: undeclared name: `Connection` (typecheck)
	var conn *Connection
	          ^
tarantool_test.go:441:24: undeclared name: `Error` (typecheck)
	if tntErr, ok := err.(Error); !ok || tntErr.Code != ErrTupleFound {
	                      ^
tarantool_test.go:698:12: undeclared name: `Connection` (typecheck)
	var conn *Connection
	          ^
tarantool_test.go:719:21: undeclared name: `Space` (typecheck)
	var space, space2 *Space
	                   ^
tarantool_test.go:759:48: undeclared name: `Field` (typecheck)
	var field1, field2, field5, field1n, field5n *Field
	                                              ^
tarantool_test.go:805:40: undeclared name: `Index` (typecheck)
	var index0, index3, index0n, index3n *Index
	                                      ^
tarantool_test.go:880:12: undeclared name: `Response` (typecheck)
	var resp *Response
	          ^
tarantool_test.go:882:12: undeclared name: `Connection` (typecheck)
	var conn *Connection
	          ^
example_test.go:7:2: "github.com/tarantool/go-tarantool" imported but not used (typecheck)
	"github.com/tarantool/go-tarantool"
	^
tarantool_test.go:12:2: "github.com/tarantool/go-tarantool" imported but not used (typecheck)
	. "github.com/tarantool/go-tarantool"
	^

I'm not sure that we should fix all these warnings.