ledger-tool: add show-entries option to bigtable block

[CriesofCarrots]

Problem

Now that entries are uploaded to bigtable, solana-ledger-tool bigtable block can reconstruct complete blocks comparable to the data returned by solana-ledger-tool slot.
Re: #34266 (review)

Summary of Changes

Add --show-entries flag to build block display struct with entries
Output looks like:

$ solana-ledger-tool bigtable block 2 --show-entries

Slot: 2
Parent Slot: 1
Blockhash: D9aBYGVchmxMprqqGDGhCcYkJXS78S4Xnygj2Lnd9pvu
Previous Blockhash: FP1G5WQBMebHhnBkCXLctcU63rkRCzkYACKsPEyZJPvT
Block Time: 2023-12-14T17:28:49-07:00
Block Height: 2
Rewards:
  Address                                            Type        Amount           New Balance           Percent Change  Commission
  9a25m7QZ2VMkiFETP2UzQxnCnUfEE3LUKbXCnWPb1mGz        fee        ◎0.000005000     ◎499.999995000          0.000001000%      -
Total Rewards: ◎0.000005000
Entry 0 - num_hashes: 1, hash: BVCqk2ssPHxpnaWLCKPvAXhHDmvvXHw2hfT8Uv9QvGoG, transactions: 0, starting_transaction_index: 0
Entry 1 - num_hashes: 1, hash: H6nwjKVKPQQDSZyTgYRXPXsY25ZqQW5yDzyQmicUGuAY, transactions: 1, starting_transaction_index: 0
  Transaction 0:
    Version: legacy
    Recent Blockhash: FP1G5WQBMebHhnBkCXLctcU63rkRCzkYACKsPEyZJPvT
    Signature 0: jva724YHSwd8W8vPNJuueeyLDEdrdqHngRyoNrbSJ1pbqb9hEVC9rBYRaLVxkz9ga1Xer5Hht3YSSUGmsXng8pw
    Signature 1: 59m7yLfF89iHvnwEbo3WjeWHF3Mm48NMQ4Ckvn852pUs3wTYtwiNkvxHkUwhfvhhnrkGqzpM5TpLtuC5TPtS6Fs7
...

This is similar to what solana-ledger-tool slot spits out. The only differences are a lower indent level and metadata (slot prints SlotMeta, bigtable block prints the block meta, like parent info and rewards).

The output still supports json:

$ solana-ledger-tool bigtable block 2 --show-entries --output json

{
  "previousBlockhash": "FP1G5WQBMebHhnBkCXLctcU63rkRCzkYACKsPEyZJPvT",
  "blockhash": "D9aBYGVchmxMprqqGDGhCcYkJXS78S4Xnygj2Lnd9pvu",
  "parentSlot": 1,
  "entries": [
    {
      "numHashes": 1,
      "hash": "BVCqk2ssPHxpnaWLCKPvAXhHDmvvXHw2hfT8Uv9QvGoG",
      "numTransactions": 0,
      "startingTransactionIndex": 0,
      "transactions": []
    },
    {
      "numHashes": 1,
      "hash": "H6nwjKVKPQQDSZyTgYRXPXsY25ZqQW5yDzyQmicUGuAY",
      "numTransactions": 1,
      "startingTransactionIndex": 0,
      "transactions": [
        {
          "transaction": [
            "AiUEBbnLDFFPNO3o2XcNB5YAzF5opjqrrf3g5waeQKmrfJya+7PpBGLETVspvVuan+NBTEA4uegUQU77gtS3JwDPn3U87KByUhG9feL1+aUKT9DG2zg9ZAhmqveFTUZZ/TbyIMlMilNt03ma8a0V+/Jdx9UoE7wxpvJf0oCQf/AKAgABA39S4rf62DlBSnKtIej8CwJ0YYwniIMHlcioNgd6s4pvBVuVE+TlbMBeJem+JRsZfMgybN1tk4+R1QMnYz4R7c4HYUgdNXR0u3xNdiTr072z2DVec9EQQ/wNo1OAAAAAANWmsE8Wa5K57r76aEUBVpRd/fjlFpnCOP04FavM0skcAQICAQE4DAAAAAAAAAAAAAAAAQEBLCW+EHZf1zNDBk/ClQMWqZ+db/ArLKUg+10mBttPS/cBwp17ZQAAAAA=",
            "base64"
          ],
          "meta": {..}
        }
      ]
    }
 ...
}

[CriesofCarrots]

I kept all the type and output work in solana-ledger-tool for now. But if we decide to, say, return these blocks with entries from RPC in the future, we can move things upstream

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4a8582e) 81.8% compared to head (286a16d) 81.8%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #34536   +/-   ##
=======================================
  Coverage    81.8%    81.8%           
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  Files         822      822           
  Lines      221532   221532           
=======================================
+ Hits       181307   181328   +21     
+ Misses      40225    40204   -21     

[steviez]

LGTM!

With the way you wrote writeln_entry(), it seems a follow-up could be to simplify the functions in solana-ledger-tool slot path (ie output_entry())

[CriesofCarrots]

With the way you wrote writeln_entry(), it seems a follow-up could be to simplify the functions in solana-ledger-tool slot path (ie output_entry())

Agreed!