cli: Anchor registry publishing

[armaniferrante]

Changes needed for the MVP of the anchor program registry for verifiable builds.

• Adds a [registry] section in the Anchor toml.
• Adds the anchor login <api-token> command.
• Adds the anchor publish <package> command.
• Adds a root level anchor_version field to the Anchor.toml for specifying the cli version to build with (verifiable builds only).
• Renames [clusters.<network>] to [programs.<network>].
• Changes workspace member/exclude path finding to require paths relative to the workspace root.
• Makes a bunch of miscellaneous fixes, e.g., so that the registry can produce verifiable builds of non anchor programs.
• • Adds solana_version setting to the Anchor.toml for setting the solana toolchain version for verifiable builds.