Add support TVP identity

[codecov[bot]]

Codecov Report

Merging #771 (de4b199) into master (c7ddec1) will decrease coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #771      +/-   ##
==========================================
- Coverage   71.34%   71.30%   -0.04%     
==========================================
  Files          24       24              
  Lines        5388     5405      +17     
==========================================
+ Hits         3844     3854      +10     
- Misses       1300     1305       +5     
- Partials      244      246       +2     

Impacted Files	Coverage Δ
types.go	77.49% <ø> (ø)
tvp_go19.go	93.53% <100.00%> (+0.51%)	:arrow_up:
tds.go	65.49% <0.00%> (-0.73%)	:arrow_down:
token.go	64.21% <0.00%> (-0.15%)	:arrow_down:

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[NikitaDef]

@kardianos please check out the MR. What do you think about @identity constant? The driver detects by that const which field is the database identity

[NikitaDef]

I changed the test for more clarity