Store ReadOnly commands and query these as bitmask

[mp911de]

Redis Cluster and Master/Slave store ReadOnly commands as array and Intent resolution iterates through the array. Using a bitmask reduces computational intensity to arithmetic operations.

Current intent resolution for all known commands:

# Warmup Iteration   1: 2282,007 ns/op
# Warmup Iteration   2: 2441,771 ns/op
# Warmup Iteration   3: 2240,678 ns/op
# Warmup Iteration   4: 2345,982 ns/op
# Warmup Iteration   5: 2312,569 ns/op
Iteration   1: 2296,601 ns/op
Iteration   2: 2284,608 ns/op
Iteration   3: 2338,286 ns/op
Iteration   4: 2351,286 ns/op
Iteration   5: 2304,565 ns/op

Optimized approach

# Warmup Iteration   1: 194,052 ns/op
# Warmup Iteration   2: 177,044 ns/op
# Warmup Iteration   3: 174,675 ns/op
# Warmup Iteration   4: 174,695 ns/op
# Warmup Iteration   5: 173,879 ns/op
Iteration   1: 173,907 ns/op
Iteration   2: 172,596 ns/op
Iteration   3: 171,966 ns/op
Iteration   4: 175,460 ns/op
Iteration   5: 180,235 ns/op

[mp911de]

Well, use EnumSet.

Enum sets are represented internally as bit vectors.