C sharp reserved keywords

[cklam2]

Attempt to solve the issue with reserved keywords, see #4248. Names will now be prefixed with @ when it is a keyword.

Note that the list of keywords is static. If Microsoft decides to extend the list then we'd have to manually update the list.

Note that changes are based on the c-sharp-improvements branch which is not yet merged to master. Hopefully that is not a big issue.

[dotansimha]

@cklam2 can you please rebase? :)
Thanks!

[cklam2]

@dotansimha thanks. I will first make a change in the code. Want to make use of that convertName feature instead. Will mention you again when rebased and ready for review/merge.

[cklam2]

Updated the code and rebased onto master. Also took the chance to clean up the unit test so format looks cleaner and bit more in line with other unit tests. Btw, new unit tests for this bug are also added.
@dotansimha code is ready for review/merge, thanks.

[dotansimha]

@cklam2 I merged this one, it includes all changes from #4264 as well, right?

[theguild-bot]

The latest changes of this PR are available as alpha in npm: 1.15.5-alpha-fd99e06a.0

Quickly update your package.json by running:

npx match-version @graphql-codegen 1.15.5-alpha-fd99e06a.0

[cklam2]

@dotansimha thanks for the merge!
#4264 is not included in this one. I rebased that branch onto the new master.

Btw, I see a branch "revert-4250-c-sharp-reserved-keywords"?

[dotansimha]

@cklam2 thanks! The revert branch was a mistake :)
I merged #4264 as well. Thank you so much !