Add "newer" snapshot serde style with accounts_data_len (and more!)

[brooksprumo]

• Rename current serde style to "older" (for snapshot version 1.2.0)
• Add a new... "newer"... serde style (for snapshot version 1.3.0)
• Remove unused bits from Bank and newer snapshot stuffs
• Add snapshot version 1.3.0
• Put accounts_data_len into snapshot (for snapshot version 1.3.0)
• New banks gets accounts_data_len from snapshot, if possible

Problem

Summary of Changes

Fixes #

Updated frozen ABI digests. Here's a diff of the previous "newer" and the current "older" style; the only changes are due to FQNs:

$ diff serde_snapshot__tests__test_bank_serialize__BankAbiTestWrapperOlder_frozen_abi__test_abi_digest_5zTpYmVsKjkvpJB8o95LJWyXe2rV7bnxRPmmfKk75brf serde_snapshot__tests__test_bank_serialize__BankAbiTestWrapperNewer_frozen_abi__test_abi_digest_7PcarCw6gpw9Yw8xypdxQP24TFjLiaHyuDkq95cgwtte
1c1
< struct BankAbiTestWrapperOlder (fields = 1)
---
> struct BankAbiTestWrapperNewer (fields = 1)
4c4
<             element solana_runtime::serde_snapshot::older::SerializableVersionedBank
---
>             element solana_runtime::serde_snapshot::newer::SerializableVersionedBank
803c803
<                     field unused_accounts: solana_runtime::serde_snapshot::older::UnusedAccounts
---
>                     field unused_accounts: solana_runtime::serde_snapshot::common::UnusedAccounts
1621c1621
<             element solana_runtime::serde_snapshot::SerializableAccountsDb<solana_runtime::serde_snapshot::older::Context>
---
>             element solana_runtime::serde_snapshot::SerializableAccountsDb<solana_runtime::serde_snapshot::newer::Context>
1623c1623
<                     element solana_runtime::serde_snapshot::utils::serialize_iter_as_map::SerializableMappedIterator<core::iter::adapters::map::Map<core::slice::iter::Iter<alloc::vec::Vec<alloc::sync::Arc<solana_runtime::accounts_db::AccountStorageEntry>>>, <solana_runtime::serde_snapshot::older::Context as solana_runtime::serde_snapshot::TypeContext>::serialize_accounts_db_fields<solana_frozen_abi::abi_digester::AbiDigester>::{{closure}}>>
---
>                     element solana_runtime::serde_snapshot::utils::serialize_iter_as_map::SerializableMappedIterator<core::iter::adapters::map::Map<core::slice::iter::Iter<alloc::vec::Vec<alloc::sync::Arc<solana_runtime::accounts_db::AccountStorageEntry>>>, <solana_runtime::serde_snapshot::newer::Context as solana_runtime::serde_snapshot::TypeContext>::serialize_accounts_db_fields<solana_frozen_abi::abi_digester::AbiDigester>::{{closure}}>>
1627c1627
<                             value solana_runtime::serde_snapshot::utils::serialize_iter_as_seq::SerializableSequencedIterator<core::iter::adapters::map::Map<core::slice::iter::Iter<alloc::sync::Arc<solana_runtime::accounts_db::AccountStorageEntry>>, <solana_runtime::serde_snapshot::older::Context as solana_runtime::serde_snapshot::TypeContext>::serialize_accounts_db_fields<solana_frozen_abi::abi_digester::AbiDigester>::{{closure}}::{{closure}}>>
---
>                             value solana_runtime::serde_snapshot::utils::serialize_iter_as_seq::SerializableSequencedIterator<core::iter::adapters::map::Map<core::slice::iter::Iter<alloc::sync::Arc<solana_runtime::accounts_db::AccountStorageEntry>>, <solana_runtime::serde_snapshot::newer::Context as solana_runtime::serde_snapshot::TypeContext>::serialize_accounts_db_fields<solana_frozen_abi::abi_digester::AbiDigester>::{{closure}}::{{closure}}>>

[codecov]

Codecov Report

Merging #22467 (17c49bc) into master (e291342) will increase coverage by 0.0%.
The diff coverage is 80.0%.

@@           Coverage Diff            @@
##           master   #22467    +/-   ##
========================================
  Coverage    81.1%    81.1%            
========================================
  Files         556      556            
  Lines      150655   150843   +188     
========================================
+ Hits       122268   122423   +155     
- Misses      28387    28420    +33     

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