Session token V2

[End-rey]

Refs nspcc-dev/neofs-api#350

[codecov]

Codecov Report

❌ Patch coverage is 81.27090% with 168 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.48%. Comparing base (b38583d) to head (02f738b).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
proto/session/types.pb.go	52.47%	115 Missing ⚠️
session/test/session.go	0.00%	20 Missing ⚠️
client/session_container.go	41.66%	7 Missing ⚠️
client/object_get.go	0.00%	3 Missing and 3 partials ⚠️
client/object_search.go	0.00%	3 Missing and 2 partials ⚠️
client/object_put.go	0.00%	2 Missing and 2 partials ⚠️
proto/session/encoding_v2.go	94.93%	4 Missing ⚠️
client/object_hash.go	0.00%	1 Missing and 1 partial ⚠️
proto/internal/test/rand.go	0.00%	2 Missing ⚠️
session/v2.go	99.59%	1 Missing and 1 partial ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #750      +/-   ##
==========================================
+ Coverage   58.10%   59.48%   +1.38%     
==========================================
  Files         165      167       +2     
  Lines       21086    18939    -2147     
==========================================
- Hits        12251    11265     -986     
+ Misses       8562     7392    -1170     
- Partials      273      282       +9     

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