Issue-945: Adding rules for return_statement production

[jeremiah-c-leary]

Resolves #945 Resolves #949

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (6057e10) 95.87% compared to head (35f4472) 95.88%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1020 +/- ## ======================================= Coverage 95.87% 95.88% ======================================= Files 1503 1507 +4 Lines 28300 28326 +26 ======================================= + Hits 27133 27159 +26 Misses 1167 1167 ``` | [Files](https://app.codecov.io/gh/jeremiah-c-leary/vhdl-style-guide/pull/1020?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jeremiah+Leary) | Coverage Δ | | |---|---|---| | [vsg/rules/function/\_\_init\_\_.py](https://app.codecov.io/gh/jeremiah-c-leary/vhdl-style-guide/pull/1020?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jeremiah+Leary#diff-dnNnL3J1bGVzL2Z1bmN0aW9uL19faW5pdF9fLnB5) | `100.00% <100.00%> (ø)` | | | [vsg/rules/function/rule\_501.py](https://app.codecov.io/gh/jeremiah-c-leary/vhdl-style-guide/pull/1020?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jeremiah+Leary#diff-dnNnL3J1bGVzL2Z1bmN0aW9uL3J1bGVfNTAxLnB5) | `100.00% <100.00%> (ø)` | | | [vsg/rules/return\_statement/\_\_init\_\_.py](https://app.codecov.io/gh/jeremiah-c-leary/vhdl-style-guide/pull/1020?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jeremiah+Leary#diff-dnNnL3J1bGVzL3JldHVybl9zdGF0ZW1lbnQvX19pbml0X18ucHk=) | `100.00% <100.00%> (ø)` | | | [vsg/rules/return\_statement/rule\_300.py](https://app.codecov.io/gh/jeremiah-c-leary/vhdl-style-guide/pull/1020?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jeremiah+Leary#diff-dnNnL3J1bGVzL3JldHVybl9zdGF0ZW1lbnQvcnVsZV8zMDAucHk=) | `100.00% <100.00%> (ø)` | | | [vsg/rules/return\_statement/rule\_500.py](https://app.codecov.io/gh/jeremiah-c-leary/vhdl-style-guide/pull/1020?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jeremiah+Leary#diff-dnNnL3J1bGVzL3JldHVybl9zdGF0ZW1lbnQvcnVsZV81MDAucHk=) | `100.00% <100.00%> (ø)` | |

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