Schema accessor

[aagrawal05]

🎉 New feature

Closes #1376

Summary

1. I've created a script format_sdf.py which reads from the /sdf/1.11 folder and generates/updates the source for all the relevant classes in the src/ and include/ directories as per the suggested implementation.
2. There were DOM elements navsat.sdf and forcetorque.sdf for which the script does not work and I had to manually edit the script because their naming convention did not match the camel-case conversion (they would need to be nav_sat.sdf and force_torque.sdf respectively to function correctly with the script) This may be undesirable from a code style perspective but may be a breaking change—this is a minor point but I just wanted to point it out.
3. The code builds successfully, I have not thoroughly tested it but it does seem to work.
4. I can add tests for the SchemaFile in all the DOM element tests but I thought it might be overkill because the names are hardcoded in the method anyways. I can add it easily with the script if needed.

Test it

Tests can be done manually as mentioned by the OP in #1376 in his code example. I could also add tests in the DOM element unit tests, but that might be overkill because the values are hard-coded.

Checklist

• [ ] Signed all commits for DCO
• [x] Added tests
• [ ] Added example and/or tutorial
• [ ] Updated documentation (as needed)
• [ ] Updated migration guide (as needed)
• [ ] Consider updating Python bindings (if the library has them)
• [ ] codecheck passed (See contributing)
• [x] All tests passed (See test coverage)
• [ ] While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.