feat: expose beet-solana gpa builder on account struct

[thlorenz]

Summary

Relying on the recent GPA beet-solana feature, solita now generates a method on each account struct to obtain a GPA builder for it.

Example

The below method is added to the AuctionHouse account.

export class AuctionHouse implements AuctionHouseArgs {
  // [ .. ]

  /**
   * Provides a {@link web3.Connection.getProgramAccounts} config builder,
   * to fetch accounts matching filters that can be specified on that builder.
   *
   * @param programId - the program that owns the accounts we are filtering
   */
  static gpaBuilder(
    programId: web3.PublicKey = new web3.PublicKey(
      'hausS13jsjafwWwGqZTUQRmWyvyxn9EQpqMwV1PBBmk'
    )
  ) {
    return beetSolana.GpaBuilder.fromStruct(programId, auctionHouseBeet)
  }
  // [ .. ]
}

Caveats

• requires latest beet: 0.4.0 and beet-solana: 0.3.0 to be used in the project whose generated code includes that feature