[#1549] fix(common): Uniformly throw RssException for external callers

[rickyma]

What changes were proposed in this pull request?

Make custom exception classes in the rss-common module inherit from RssException.

Why are the changes needed?

For #1549

Does this PR introduce any user-facing change?

No.

How was this patch tested?

Existing UTs.

[rickyma]

@jerqi @zuston PTAL.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.57%. Comparing base (12f9271) to head (b1884f9).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1550      +/-   ##
============================================
+ Coverage     53.61%   54.57%   +0.96%     
- Complexity     2815     2816       +1     
============================================
  Files           436      416      -20     
  Lines         24536    22175    -2361     
  Branches       2076     2076              
============================================
- Hits          13155    12103    -1052     
+ Misses        10560     9322    -1238     
+ Partials        821      750      -71     

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[github-actions]

Test Results

2 312 files  + 50  2 312 suites  +50   4h 37m 45s ⏱️ + 14m 5s
  823 tests ±  0    822 ✅ +  1   1 💤 ±0  0 ❌  - 1 
9 693 runs  +159  9 679 ✅ +160  14 💤 ±0  0 ❌  - 1 

Results for commit b1884f9. ± Comparison against base commit 12f9271.

[jerqi]

LGTM.