parser: limit maximum number of tokens

[IvanGoncharov]

Backport of #3684
Motivation: Parser CPU and memory usage is linear to the number of tokens in a
document however in extreme cases it becomes quadratic due to memory exhaustion.
On my mashine it happens on queries with 2k tokens.
For example:

{ a a <repeat 2k times> a }

It takes 741ms on my machine.
But if we create document of the same size but smaller number of
tokens it would be a lot faster.
Example:

{ a(arg: "a <repeat 2k times> a" }

Now it takes only 17ms to process, which is 43 time faster.

That mean if we limit document size we should make this limit small
since it take only two bytes to create a token, e.g. a.
But that will hart legit documents that have long tokens in them
(comments, describtions, strings, long names, etc.).

That's why this PR adds a mechanism to limit number of token in
parsed document.
Also exact same mechanism implemented in graphql-java, see:
graphql-java/graphql-java#2549

I also tried alternative approach of counting nodes and it gives
slightly better approximation of how many resources would be consumed.
However comparing to the tokens, AST nodes is implementation detail of graphql-js
so it's imposible to replicate in other implementation (e.g. to count
this number on a client).

• Apply suggestions from code review

Co-authored-by: Yaacov Rydzinski yaacovCR@gmail.com

Co-authored-by: Yaacov Rydzinski yaacovCR@gmail.com

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