Added capability to include first row in result of query with strong typed mapping

[michelebastione]

• Resolves Including first row in strong typed mapped Query from sheet with no header #542 by adding a parameter hasHeader to MiniExcel.Query<T> and MiniExcel.QueryAsync<T> that, when set to false, wil not treat the first row as a header but instead include its data in the result set. For the operation to be successful in absence of a header all the required properties have to be decorated with an ExcelColumnIndex attribute.
• Added a test, a sample and some code cleanup

[izanhzh]

Hi @michelebastione

Thank you for reaching out to me and trusting me with the review. However, I want to clarify that I am not one of the core maintainers/responsible persons for this project. I am concerned that I might not be the best person to provide a thorough and accurate review.

Therefore, I will remove myself from the review list and wait for the author to handle the review.

Best regards

[michelebastione]

@izanhzh Thank you for the clarification, given you are one of the most active members I assumed you were part of the core team.

@shps951023 What do you think of this change?

[shps951023]

@izanhzh Thank you for the clarification, given you are one of the most active members I assumed you were part of the core team.

@shps951023 What do you think of this change?

LGTM👍, but I don't have the requirements in my tasks.