Issue#976: Added prefix and suffix rules for function designators.

[jeremiah-c-leary]

Resolves #976

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (3954326) 95.89% compared to head (31320d5) 95.89%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #987 +/- ## ======================================= Coverage 95.89% 95.89% ======================================= Files 1497 1499 +2 Lines 28146 28166 +20 ======================================= + Hits 26990 27010 +20 Misses 1156 1156 ``` | [Files Changed](https://app.codecov.io/gh/jeremiah-c-leary/vhdl-style-guide/pull/987?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/987?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\_600.py](https://app.codecov.io/gh/jeremiah-c-leary/vhdl-style-guide/pull/987?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jeremiah+Leary#diff-dnNnL3J1bGVzL2Z1bmN0aW9uL3J1bGVfNjAwLnB5) | `100.00% <100.00%> (ø)` | | | [vsg/rules/function/rule\_601.py](https://app.codecov.io/gh/jeremiah-c-leary/vhdl-style-guide/pull/987?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jeremiah+Leary#diff-dnNnL3J1bGVzL2Z1bmN0aW9uL3J1bGVfNjAxLnB5) | `100.00% <100.00%> (ø)` | |

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