cli: Warn if a manifest has solana-program dependency

[acheroncrypto]

Problem

Adding solana-program to the dependencies list in Cargo.toml should be avoided, as it's likely to increase the possibility of version conflicts between v1 and v2 (#3219). Users should instead use the exported anchor_lang::solana_program.

Summary of changes

Warn if a user's manifest has solana-program dependency:

WARNING: Adding `solana-program` as a separate dependency might cause conflicts.
To solve, remove the `solana-program` dependency and use the exported crate from `anchor-lang`.
`use solana_program` becomes `use anchor_lang::solana_program`.
Program name: `my-program`

[vercel]

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