Fix bug with creating records on tables without a primary key

[Shraeyas]

Fixes #3246

Technical details

• Added condition to check if a primary key exists on table and updated error message to "You cannot insert into tables without a primary key" and status code to 405 if a user tries to insert a new record.
• Added MethodNotAllowedAPIException error class.
• Updated test coverage for validating record creation on tables without primary key .

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the develop branch of the repository
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

Developer Certificate of Origin

Developer Certificate of Origin

Developer Certificate of Origin
Version 1.1

Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
1 Letterman Drive
Suite D4700
San Francisco, CA, 94129

Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.


Developer's Certificate of Origin 1.1

By making a contribution to this project, I certify that:

(a) The contribution was created in whole or in part by me and I
    have the right to submit it under the open source license
    indicated in the file; or

(b) The contribution is based upon previous work that, to the best
    of my knowledge, is covered under an appropriate open source
    license and I have the right under that license to submit that
    work with modifications, whether created in whole or in part
    by me, under the same open source license (unless I am
    permitted to submit under a different license), as indicated
    in the file; or

(c) The contribution was provided directly to me by some other
    person who certified (a), (b) or (c) and I have not modified
    it.

(d) I understand and agree that this project and the contribution
    are public and that a record of the contribution (including all
    personal information I submit with it, including my sign-off) is
    maintained indefinitely and may be redistributed consistent with
    this project or the open source license(s) involved.

[Shraeyas]

@mathemancer This will fix #3246

I've updated the tests as well. Can you review this?

[Shraeyas]

Not sure why the particular test is failing. It is working fine on my local setup.

[mathemancer]

@Shraeyas Don't worry about that test failure. We have a problem with the CI pipeline, addressed by #3254

[mathemancer]

Overall, pretty good!

I do have one small request; see the specific comment.

[mathemancer]

Please check for a more specific Exception here.

[Shraeyas]

I've changed it to 'AssertionError'. Refer to this commit.

@mathemancer @Anish9901

[Anish9901]

Looks good @Shraeyas, thanks for your contribution!

Ready to be merged