V2 integration tests (RichardKnop#628)

* fix: fix redis issues

* fix: fix examples

* feat: v2 integration tests, improvements

* chore: move examples into v1/v2 subfolders

fix: fix redis issues (RichardKnop#626)

* fix: fix redis issues

* fix: fix examples

v1/common/broker.go: add read lock for registerdTaskNames (RichardKno…

…p#623)

chore: update dependencies (RichardKnop#618)

fix: make registerTask safe on concurrent use (RichardKnop#616)

Co-authored-by: chengwanli <chengwanli@p1staff.com>

fix: make sure eager lock is defaulted to (RichardKnop#611)

chore: update README

refactor: update README and dependencies (RichardKnop#607)

* refactor: update README and dependencies

* fix: fix unit test

* refactor: small refactoring

feat: Support customized delayed tasks key in redigo implementation (R…

…ichardKnop#595)

feat: update redis libraries to new versions (RichardKnop#584)