Type hint and validate Instance and Solution dictionaries

[leonlan]

Closes #99.

TODO

• [ ] Validate Instance and Solution objects (see stash validate-typing)
• [ ] Make a new validate module that validates the instance and solution outputs according to VRPLIB.

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (580386e) 100.00% compared to head (f28e057) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #100 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 16 18 +2 Lines 261 282 +21 ========================================= + Hits 261 282 +21 ``` | [Impacted Files](https://app.codecov.io/gh/leonlan/VRPLIB/pull/100?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Leon+Lan) | Coverage Δ | | |---|---|---| | [vrplib/Instance.py](https://app.codecov.io/gh/leonlan/VRPLIB/pull/100?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Leon+Lan#diff-dnJwbGliL0luc3RhbmNlLnB5) | `100.00% <100.00%> (ø)` | | | [vrplib/Solution.py](https://app.codecov.io/gh/leonlan/VRPLIB/pull/100?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Leon+Lan#diff-dnJwbGliL1NvbHV0aW9uLnB5) | `100.00% <100.00%> (ø)` | | | [vrplib/parse/parse\_distances.py](https://app.codecov.io/gh/leonlan/VRPLIB/pull/100?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Leon+Lan#diff-dnJwbGliL3BhcnNlL3BhcnNlX2Rpc3RhbmNlcy5weQ==) | `100.00% <100.00%> (ø)` | | | [vrplib/parse/parse\_solomon.py](https://app.codecov.io/gh/leonlan/VRPLIB/pull/100?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Leon+Lan#diff-dnJwbGliL3BhcnNlL3BhcnNlX3NvbG9tb24ucHk=) | `100.00% <100.00%> (ø)` | | | [vrplib/parse/parse\_solution.py](https://app.codecov.io/gh/leonlan/VRPLIB/pull/100?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Leon+Lan#diff-dnJwbGliL3BhcnNlL3BhcnNlX3NvbHV0aW9uLnB5) | `100.00% <100.00%> (ø)` | | | [vrplib/parse/parse\_vrplib.py](https://app.codecov.io/gh/leonlan/VRPLIB/pull/100?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Leon+Lan#diff-dnJwbGliL3BhcnNlL3BhcnNlX3ZycGxpYi5weQ==) | `100.00% <100.00%> (ø)` | |

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[leonlan]

Not continuing with this.