Implement NameNode functions and tests

[CheeksTheGeek]

• NameNode functions

  • Implement block_size to handle client requests and return block size or error
  • Implement read_file to handle client requests, retrieve file blocks, and return block addresses
  • Implement write_file to handle client requests, calculate number of blocks, and assign blocks
  • Implement phoenixing to handle client requests, log dead data nodes, and attempt re-replication
  • Implement assign_blocks_for_file to initialize FileNameToBlocks map, assign data nodes, and return block addresses

• Tests

  • Create tests for block_size, read_file, write_file, phoenixing, and assign_blocks_for_file functions