feat(v2:replay): basic async account fetching

[prestonsn]

Adds the AccountFetcher and AccountResolver and integrates them into replay, allowing it to asynchronously fetch accounts from accountsdb.

• AccountFetcher implementation
• Unit tests for AccountFetcher
• AccountResolver implementation
• Unit tests for AccountResolver
• Integration with replay
• Basic unit tests for replay + new account resolution

Still WIP.

[codecov]

Codecov Report

❌ Patch coverage is 94.79675% with 32 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
v2/services/accounts_db.zig	0.00%	15 Missing ⚠️
v2/lib/replay/account_fetcher.zig	98.19%	7 Missing ⚠️
v2/lib/accounts_db/rooted.zig	95.55%	4 Missing ⚠️
v2/lib/replay/unrooted.zig	92.45%	4 Missing ⚠️
v2/lib/solana/account_lookup_table.zig	98.46%	1 Missing ⚠️
v2/services/replay.zig	0.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
v2/lib/accounts_db.zig	88.23% <ø> (+17.64%)	⬆️
v2/lib/replay.zig	0.00% <ø> (ø)
v2/lib/solana/transaction.zig	97.99% <100.00%> (+<0.01%)	⬆️
v2/lib/solana/account_lookup_table.zig	98.46% <98.46%> (ø)
v2/services/replay.zig	39.69% <0.00%> (+1.67%)	⬆️
v2/lib/accounts_db/rooted.zig	58.64% <95.55%> (+58.64%)	⬆️
v2/lib/replay/unrooted.zig	92.45% <92.45%> (ø)
v2/lib/replay/account_fetcher.zig	98.19% <98.19%> (ø)
v2/services/accounts_db.zig	0.00% <0.00%> (ø)

... and 9 files with indirect coverage changes

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