refactor(fuzz): make fuzzer entrypoint use CLI and responsible for more setup

[InKryption]

Start centralizing the responsibility of setting up the main allocator, logger, and parsing CLI args in the fuzzer entrypoint, and have each fuzzer simply describe what it needs; in this PR that hoisting of responsibility is only done for accountsdb fuzzer, with other fuzzers simply taking args: []const []const u8 where relevant, with a TODO stub for each.

[InKryption]

• refactor(fuzz:ledger): Simplify and improve ledger fuzzer #925
• refactor(fuzz:accountsdb,gossip,ledger,allocators): Implement fuzzer subcommands #924
• refactor(fuzz): make fuzzer entrypoint use CLI and responsible for more setup #908 👈 (View in Graphite)
• refactor(accountsdb:fuzz): General improvements to the fuzzer #904
• main

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/ledger/fuzz.zig	0.00%	2 Missing ⚠️
src/accountsdb/fuzz.zig	0.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
src/utils/allocators.zig	82.67% <ø> (ø)
src/accountsdb/fuzz.zig	0.00% <0.00%> (ø)
src/ledger/fuzz.zig	93.61% <0.00%> (ø)

... and 7 files with indirect coverage changes

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