refactor: redesign zero-copy types to make them simpler, faster and less-error prone

[snawaz]

• Breaking changes due to enforcement of alignment requirements and the fixed_layout types.
• Redesign zero-copy types to make them simpler, faster and less-error prone.
• Use 8 bytes for instruction discriminator, so as to enforce 8-byte alignment for instruction-data.
• Split instructions into two enum types:
  • enum ESplInstruction defined in the api crate.
  • enum ESplInternalInstruction defined in the program crate and made private.

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[snawaz]

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This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• refactor: add debug_log and use it replacing guarded logs #69
• refactor: heap implemetation #68
• refactor: redesign zero-copy types to make them simpler, faster and less-error prone #67 👈 (View in Graphite)
• feat: add proc macro: fixed_layout  #66
• refactor: use requires to assert and automatically log richer information on failure #65
• doc: add documentation for all processors #64
• chore: reorganize the files #63
• audit: review selected process_* #62
• main

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