findAt
Finds a non-structure token at the given position. A token is considered to be at the given position if the position is within the token's location.
For example, given the following source code:
package foo.bar.baz
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Any position within the token package
will return that token, including bordering positions (before the p or after the e).
Return
the token at the given position, or null if there is no token at the given position