support session token for object storage

[davies]

close #2236

[codecov-commenter]

Codecov Report

Merging #2261 (d012f9d) into main (32fbe0d) will increase coverage by 0.21%.
The diff coverage is 48.74%.

@@            Coverage Diff             @@
##             main    #2261      +/-   ##
==========================================
+ Coverage   61.74%   61.95%   +0.21%     
==========================================
  Files         138      137       -1     
  Lines       25052    25236     +184     
==========================================
+ Hits        15468    15635     +167     
- Misses       7784     7794      +10     
- Partials     1800     1807       +7     

Impacted Files	Coverage Δ
cmd/mount.go	61.73% <0.00%> (-0.23%)	⬇️
pkg/object/azure.go	1.69% <0.00%> (ø)
pkg/object/b2.go	2.04% <0.00%> (ø)
pkg/object/bos.go	1.50% <0.00%> (ø)
pkg/object/cos.go	1.36% <0.00%> (-0.02%)	⬇️
pkg/object/eos.go	6.06% <0.00%> (-0.40%)	⬇️
pkg/object/etcd.go	1.90% <0.00%> (ø)
pkg/object/gs.go	2.15% <0.00%> (ø)
pkg/object/ibmcos.go	1.28% <0.00%> (ø)
pkg/object/jss.go	6.06% <0.00%> (ø)
... and 52 more

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