feat(lib): add public library root exports

src/root.zig

@@ -0,0 +1,19 @@
+const std = @import("std");
+const db = @import("db.zig");
+
+pub const Db = db.Db;
+pub const Options = db.Options;
+pub const Entry = db.Entry;
+pub const RangeIterator = db.RangeIterator;
+pub const Snapshot = db.Snapshot;
+pub const WriteBatch = db.WriteBatch;
+
+pub const Kind = @import("encode.zig").Kind;
+pub const Bloom = @import("bloom.zig").Bloom;
+pub const Memtable = @import("memtable.zig").Memtable;
+pub const Wal = @import("wal.zig").Wal;
+pub const sstable = @import("sstable.zig");
+pub const BlockCache = @import("cache.zig").BlockCache;
+pub const compress = @import("compress.zig");
+pub const Transaction = @import("txn.zig").Transaction;
+pub const Stats = @import("stats.zig").Stats;