[DO NOT MERGE YET][ds-sam] adding current stake and stake delta columns

[ochaloup]

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[janlegner]

Do not merge yet

[ochaloup]

@janlegner I tried to do an update for the PR based on our conversation elsewhere. My thinking:

• The title column should be a short text. I was considering maybe Delta or Diff to add but then the title is a bit long.
• I believe a tooltip can provide the required info.
• Naming is always a trouble and here it's not clear to me which direction it should be stated if the good proposition is when missing stake and bigger target will deliver it or if that's a different meaning.