Add implicit-str-concat & inconsistent-return-statements check

[Ruchip16]

The implicit-str-concat rule ensures that the string concatenation is done implicitly in an assignment statement using an explicit operator, such as + or other methods like string-formatting, etc. This can improve code readability and reduce the likelihood of introducing errors related to string concatenation.

The inconsistent-return-statements rule raises an error when a function has multiple return statements, and some of them return an expression while others do not. This can lead to unexpected behavior and make the code harder to understand. The check ensures that the function has consistent return statements and that it always returns an expression or none of them return an expression, making the code more predictable and easier to understand.

[audgirka]

@Ruchip16 why do we need a concatenation here?
It can be a single string right?
Am I missing something?

[Ruchip16]

yeaa i thought they are two separate strings and hence I did not combine them into one but good point we can just make it a single string @ssbarnea shall we combine them into just one string?