[WIP] clarify new_shares_sum field of SubmitShares.Success

[plebhash]

close #125

Markdown rendering of my fork

[pavlenex]

Thanks for adding these graphics, it makes things way easier to understand!

[plebhash]

note:

I should take the opportunity of this PR to also clarify this:

| Field Name                 | Data Type | Description                                         |
| -------------------------- | --------- | --------------------------------------------------- |
| channel_id                 | U32       | Channel identification                              |
| last_sequence_number       | U32       | Most recent sequence number with a correct result   |
| new_submits_accepted_count | U32       | Count of new submits acknowledged within this batch |
| new_shares_sum             | U64       | Sum of difficulty of shares acknowledged within this batch        |

the description of new_submits_accepted_count and new_shares_sum is still a bit confusing to me

currently, when SRI sends a SubmitSharess.Success, it is doing something like:

• Count of new submits acknowledged SO FAR, including this batch, not within this batch
• Sum of difficulty of shares acknowledged SO FAR, including this batch, not within this batch

[plebhash]

with regards to the comment above, I confirmed that SRI is currently incorrect

stratum-mining/stratum#1967

that should be fixed via stratum-mining/stratum#1968