stats: figure out how many blocks they propose

[pro-wh]

sample output:

$ ./go/extra/stats/stats entity-signatures --address unix:../testnet/quest-c/serverdir/node/internal.sock --start-block 0 --end-block 100 --top-n 100
|Rank |Entity ID                                                       |Nodes |Signatures| Proposals|
-----------------------------------------------------------------------------------------------------
|1    |p6UuBtDdJQNJl513U7caGqALObw5obOgpQ6dwpgnlpI=                    |     1|       100|         2|
|2    |rUywd4hma3h5cmKGkeYskIRAdrxqw6OBPi6JfuCOWHs=                    |     1|       100|         2|
|3    |eTpIJnjpMlm+qEgsW76eWYNxsh2xwLdlbIPXjXAoYTQ=                    |     1|       100|         2|
|4    |5s7OfLEjIrePZ35UnkwrPQ7YVyzd5HAiddbWZKYLo5w=                    |     1|       100|         2|
|5    |ot4uIdQrmBc2QsyEb0iBz6qCnCWenTVGNnSIL91kejE=                    |     1|       100|         3|
|6    |jYJJ7MIm3HUMIxdRLIIsaP/qB7T3PMZ7xoiT7BiFwzI=                    |     1|       100|         6|
|7    |fO4izgR+Ok4z1QJGKToAWG6a4BC4WCA+F9dU3PlafbQ=                    |     1|       100|         2|
|8    |/fgHhks5RMJ/W5ymnYCriSg73D+gkWFqH9CAfd1Xqo0=                    |     1|       100|         2|
|9    |N2xjsaubEThYSGPBka1HFW3Rv7PtYhzEFqqlGzyKIf8=                    |     1|       100|         2|
|10   |TYcIa2zx+Wx0Ut3kFnIFzHgxnWpkBlWt6YyCJLtx+N4=                    |     1|       100|         2|

[codecov]

Codecov Report

Merging #2693 into master will increase coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2693      +/-   ##
==========================================
+ Coverage   63.14%   63.27%   +0.12%     
==========================================
  Files         376      376              
  Lines       35324    35324              
==========================================
+ Hits        22307    22350      +43     
+ Misses      10222    10185      -37     
+ Partials     2795     2789       -6

Impacted Files	Coverage Δ
go/worker/storage/service_external.go	47.31% <0%> (-6.46%)	⬇️
go/consensus/tendermint/roothash/roothash.go	68.91% <0%> (-2.63%)	⬇️
go/roothash/tests/tester.go	95.54% <0%> (-0.64%)	⬇️
go/consensus/tendermint/abci/mux.go	71.57% <0%> (-0.5%)	⬇️
go/worker/compute/executor/committee/node.go	65.15% <0%> (-0.2%)	⬇️
go/worker/compute/merge/committee/node.go	75.87% <0%> (ø)	⬆️
go/consensus/tendermint/tendermint.go	67.59% <0%> (+0.55%)	⬆️
go/storage/client/client.go	78.99% <0%> (+0.84%)	⬆️
go/runtime/transaction/transaction.go	78.31% <0%> (+1.2%)	⬆️
go/worker/storage/committee/checkpointer.go	68.14% <0%> (+1.76%)	⬆️
... and 13 more

---

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