refactor: move ramstk_rpn to sub-package

[weibullguy]

Does this PR introduce a breaking change?

• Yes
• No

Describe the purpose of this pull request.

To move the common database tables to sub-packages under commondb.

Describe how this was implemented.

Created sub-package for rasmtk_rpn. Moved ramstk_rpn.py to sub-package as record.py. Created table.py. Updated ramstk_rpn test suite.

Describe any particular area(s) reviewers should focus on.

None

Provide any other pertinent information.

Partially implements #846

Pull Request Checklist

• Code Style

  • Code is following code style guidelines.

• Static Checks

  • Failing static checks are only applicable to code outside the scope of
    this PR.

• Tests

  • At least one test for all newly created functions/methods?

• Chores

  • Issue(s) have been raised for problem areas outside the scope of
    this PR. These problem areas have been decorated with an ISSUE: # comment.

[sourcery-ai]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 1.50%.

Quality metrics	Before	After	Change
Complexity	0.84 ⭐	0.94 ⭐	0.10 👎
Method Length	54.54 ⭐	61.09 🙂	6.55 👎
Working memory	5.18 ⭐	5.35 ⭐	0.17 👎
Quality	81.80% ⭐	80.30% ⭐	-1.50% 👎

Other metrics	Before	After	Change
Lines	988	913	-75

Changed files	Quality Before	Quality After	Quality Change
src/ramstk/models/init.py	%	%	%
src/ramstk/models/commondb/init.py	%	%	%
src/ramstk/models/commondb/database.py	80.31% ⭐	80.30% ⭐	-0.01% 👎

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
src/ramstk/models/commondb/database.py	RAMSTKCommonDB.do_load_site_info	1 ⭐	360 ⛔	7 🙂	57.30% 🙂	Try splitting into smaller methods
src/ramstk/models/commondb/database.py	RAMSTKCommonDB.do_load_site_variables	0 ⭐	164 😞	6 ⭐	70.59% 🙂	Try splitting into smaller methods

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• 🙂 good
• 😞 poor
• ⛔ very poor

The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Merging #1002 (dcc54b7) into master (2c88488) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1002      +/-   ##
==========================================
+ Coverage   94.89%   94.90%   +0.01%     
==========================================
  Files         176      178       +2     
  Lines        5286     5299      +13     
  Branches      504      505       +1     
==========================================
+ Hits         5016     5029      +13     
  Misses        235      235              
  Partials       35       35              

Flag	Coverage Δ
3.6	94.90% <100.00%> (+0.01%)	⬆️
3.7	94.90% <100.00%> (+0.01%)	⬆️
3.8	94.90% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/ramstk/models/__init__.py	100.00% <ø> (ø)
src/ramstk/models/commondb/__init__.py	100.00% <ø> (ø)
src/ramstk/models/commondb/database.py	100.00% <ø> (ø)
src/ramstk/models/commondb/rpn/__init__.py	100.00% <100.00%> (ø)
src/ramstk/models/commondb/rpn/record.py	100.00% <100.00%> (ø)
src/ramstk/models/commondb/rpn/table.py	100.00% <100.00%> (ø)

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