Add missing delegated methods to Session

[vbergeron]

Previous iteration on the Session API were mising the .stream and
.cursor methods from the PreparedQuery delegation.

I also cleaned up the type parameter on .transaction since it was never used.

[codecov]

Codecov Report

Merging #774 (55c0f9b) into main (9a4d320) will decrease coverage by 0.05%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##             main     #774      +/-   ##
==========================================
- Coverage   84.89%   84.84%   -0.06%     
==========================================
  Files         124      124              
  Lines        1668     1669       +1     
  Branches      109      117       +8     
==========================================
  Hits         1416     1416              
- Misses        252      253       +1     

Impacted Files	Coverage Δ
modules/core/shared/src/main/scala/Session.scala	56.96% <33.33%> (-0.74%)	⬇️

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