Expand unit-tests for the middleware, fix panic caused by empty default configuration

[gaby]

Completed:

• Fixed panic caused by passing an empty config to redirect.New()
• Added unit-tests for Filter function.
• Added unit-tests for Regex Rules.
• Added unit-tests for default config
• Coverage report is now at 100% of statements
• Added go 1.19.x to test suite

Fixes:

• Issue Add Test for Filter Parameter #43

Results:

ubuntu@ubuntu:~/Desktop/git/fix/redirect$ go test -cover ./...
ok  	github.com/gofiber/redirect/v2	(cached)	coverage: 100.0% of statements
ubuntu@ubuntu:~/Desktop/git/fix/redirect$ go test -v ./...
=== RUN   Test_Redirect
=== RUN   Test_Redirect/should_be_returns_status_302_without_a_wildcard
=== RUN   Test_Redirect/should_be_returns_status_307_using_wildcard
=== RUN   Test_Redirect/should_be_returns_status_303_without_set_redirectTo_to_use_the_default
=== RUN   Test_Redirect/should_return_the_status_code_default
=== RUN   Test_Redirect/access_URL_without_rule
=== RUN   Test_Redirect/redirect_to_swagger_route
=== RUN   Test_Redirect/no_redirect_to_swagger_route
=== RUN   Test_Redirect/no_redirect_to_swagger_route_#2
--- PASS: Test_Redirect (0.00s)
    --- PASS: Test_Redirect/should_be_returns_status_302_without_a_wildcard (0.00s)
    --- PASS: Test_Redirect/should_be_returns_status_307_using_wildcard (0.00s)
    --- PASS: Test_Redirect/should_be_returns_status_303_without_set_redirectTo_to_use_the_default (0.00s)
    --- PASS: Test_Redirect/should_return_the_status_code_default (0.00s)
    --- PASS: Test_Redirect/access_URL_without_rule (0.00s)
    --- PASS: Test_Redirect/redirect_to_swagger_route (0.00s)
    --- PASS: Test_Redirect/no_redirect_to_swagger_route (0.00s)
    --- PASS: Test_Redirect/no_redirect_to_swagger_route_#2 (0.00s)
=== RUN   Test_Filter
--- PASS: Test_Filter (0.00s)
=== RUN   Test_NoRules
--- PASS: Test_NoRules (0.00s)
=== RUN   Test_DefaultConfig
--- PASS: Test_DefaultConfig (0.00s)
=== RUN   Test_RegexRules
    main_test.go:292: Recovered from invalid regex:  regexp: Compile(`($`): error parsing regexp: missing closing ): `($`
--- PASS: Test_RegexRules (0.00s)
PASS
ok  	github.com/gofiber/redirect/v2	(cached)