fix: allow using existing session token(String) in place autocomplete

[SethMyers]

Fixes #689

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[codecov-io]

Codecov Report

Merging #722 (9907e11) into master (b0a48af) will decrease coverage by 0.06%.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##             master     #722      +/-   ##
============================================
- Coverage     69.11%   69.05%   -0.07%     
  Complexity      531      531              
============================================
  Files           129      129              
  Lines          2888     2895       +7     
  Branches        284      283       -1     
============================================
+ Hits           1996     1999       +3     
- Misses          739      744       +5     
+ Partials        153      152       -1     

Impacted Files	Coverage Δ	Complexity Δ
...ain/java/com/google/maps/DirectionsApiRequest.java	67.56% <ø> (ø)	24.00 <0.00> (ø)
...java/com/google/maps/DistanceMatrixApiRequest.java	53.84% <ø> (ø)	13.00 <0.00> (ø)
src/main/java/com/google/maps/GeoApiContext.java	61.07% <0.00%> (-0.84%)	18.00 <0.00> (ø)
...java/com/google/maps/PlaceAutocompleteRequest.java	58.82% <0.00%> (-5.70%)	12.00 <0.00> (ø)
src/main/java/com/google/maps/DirectionsApi.java	86.36% <100.00%> (+5.41%)	3.00 <0.00> (ø)
...main/java/com/google/maps/errors/ApiException.java	39.13% <100.00%> (ø)	9.00 <0.00> (ø)
...c/main/java/com/google/maps/model/AddressType.java	100.00% <100.00%> (ø)	6.00 <0.00> (ø)

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[SethMyers]

@googlebot I signed it!

[arriolac]

I would expect token here to be a string representation of a UUID after reading this comment, but that's not the case given the implementation. While this provides convenience, I think this is potentially error-prone. I suggest either clarifying the comment, or keeping the existing API of constructing a SessionToken from a UUID. The latter seems like a clearer API to me, but if a convenience initializer is useful for others, I'm happy to merge in.

[SethMyers]

would
@param token The character string to be used as the unique identifier for this session.
be clear enough?

[vojtapol]

keeping the existing API

The existing API does not work well if the session identifier is not a UUID.