Add wal_dump tool

[adsharma]

wal_dump foo
WAL File:foo.wal

WAL Header:
  Database ID: 37e5dae3-30ba-44a6-ae72-9a0cd35d5927
  Checksums Enabled: true
  File Size: 2410009 bytes

Record offsets:
  0
Stack trace (most recent call first):
#0 0x0000b71de275b163 in lbug::common::StorageException::StorageException(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) at /home/ubuntu/src/ladybug/src/include/common/exception/storage.h:11:94
#1 0x0000b71de275ae2f in lbug::storage::ChecksumReader::onObjectEnd() at /home/ubuntu/src/ladybug/src/storage/wal/checksum_reader.cpp:52:76
#2 0x0000b71de26b7cc7 in main at /home/ubuntu/src/ladybug/tools/wal_dump/main.cpp:86:58
#3 0x0000f96bf97184c3 in __libc_start_call_main at ./csu/../sysdeps/nptl/libc_start_call_main.h:58:16
#4 0x0000f96bf9718597 in __libc_start_main_impl at ./csu/../csu/libc-start.c:360:3
#5 0x0000b71de26b95ef in _start at /home/ubuntu/src/ladybug/build/relwithdebinfo/tools/wal_dump/wal_dump

Error: WAL file is corrupted - checksum verification failed.
This WAL file cannot be read.

Related to: #113