chore: upgrade chart version to 0.0.4

[wangxye]

change:

1. upgrade chart version to 0.0.4 for new chart release;
2. update tag for user-specified;
3. use appVersion as default;

[codecov]

Codecov Report

Merging #780 (eb32c53) into main (9a8d42a) will increase coverage by 0.02%.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #780      +/-   ##
============================================
+ Coverage     57.52%   57.54%   +0.02%     
- Complexity     1222     1225       +3     
============================================
  Files           131      131              
  Lines          8042     8042              
  Branches        740      740              
============================================
+ Hits           4626     4628       +2     
  Misses         3017     3017              
+ Partials        399      397       -2     

Components	Coverage Δ
RocketMQ Broker	∅ <ø> (∅)
RocketMQ Common	5.80% <ø> (ø)
RocketMQ Controller	55.13% <ø> (ø)
RocketMQ Proxy	42.75% <ø> (+0.12%)	⬆️
RocketMQ Store	77.00% <ø> (ø)
RocketMQ Stream	∅ <ø> (∅)
RocketMQ Metadata	35.44% <ø> (ø)

see 1 file with indirect coverage changes