Add tests for src/module examples

[Codebells]

We found there is coredump in hellodict #1395 , and there is no tcl test for these example modules.

1. Add tcl for src/module example.
   • helloblock tcl
   • hellodict tcl
   • hellotimer tcl
   • hellotype tcl
   • helloworld tcl
2. Add a common tcl function check_commands_specs to check command by command getkeys.
   • Use this function, we can test all command by command getkeys, except the following two kind of command.
     • cmd flags is CMD_KEY_NOT_KEY
     • cmd with special parameters, like xread.

I recommand all module's tcl test to add this function to check command.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.85%. Comparing base (e8078b7) to head (aeb2109).

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #1407      +/-   ##
============================================
+ Coverage     70.78%   70.85%   +0.07%     
============================================
  Files           118      118              
  Lines         63561    63561              
============================================
+ Hits          44994    45039      +45     
+ Misses        18567    18522      -45     

see 12 files with indirect coverage changes

[enjoy-binbin]

please also do a module unload in the end

[Codebells]

When I try to unload hellotype module, I found there is only VM_CreateDataTypefunction, why don't have any function to delete it? So that I can't unload hellotype module, because of ERR Error unloading module: the module exports one or more module-side data types can't unload.

[artikell]

i think u can skip unload hello_type module