Add cpdb support to speed up parsing

[a-r-j]

What does this implement/fix? Explain your changes

Uses cpdb to parse PDB files for improved performance

What testing did you do to verify the changes in this PR?

Added + modified tests.

Pull Request Checklist

• [ ] Added a note about the modification or contribution to the ./CHANGELOG.md file (if applicable)
• [ ] Added appropriate unit test functions in the ./graphein/tests/* directories (if applicable)
• [ ] Modify documentation in the corresponding Jupyter Notebook under ./notebooks/ (if applicable)
• [ ] Ran python -m py.test tests/ and make sure that all unit tests pass (for small modifications, it might be sufficient to only run the specific test file, e.g., python -m py.test tests/protein/test_graphs.py)
• [ ] Checked for style issues by running black . and isort .

[sonarcloud[bot]]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
64.1% Duplication

Catch issues before they fail your Quality Gate with our IDE extension SonarLint

[sonarcloud[bot]]

SonarCloud Quality Gate failed.   

1 Bug
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
28.0% Duplication

Catch issues before they fail your Quality Gate with our IDE extension SonarLint

[sonarcloud[bot]]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

No Coverage information
25.5% Duplication

Catch issues before they fail your Quality Gate with our IDE extension SonarLint

[sonarcloud[bot]]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
21.5% Duplication

Catch issues before they fail your Quality Gate with our IDE extension SonarLint

[sonarcloud[bot]]

Quality Gate failed

Failed conditions

1 Security Hotspot
13.7% Duplication on New Code (required ≤ 5%)

See analysis details on SonarCloud

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud