Create Java code snippets for cuckoo filters

[sav-norem]

The redis.io webpage for cuckoo filters needs the Java example as well. The python equivalent can be used to copy the setup and can be found here

The first line of the file needs to be the ID for the example - # EXAMPLE: cuckoo_tutorial

Each separate section is delimited with a tag that you will need to copy exactly for it to appear in the correct place, ie.

# STEP_START cuckoo
{code}                                    
# STEP_END

# HIDE_START, # HIDE_END, # REMOVE_START, and # REMOVE_END can be used for debugging and deleting keys. Hide will hide until a user expands the example, remove will only be seen in the source code and will never appear on the webpage.

@dwdougherty and I will be reviewing and tracking these issues - feel free to tag us with any questions

[sazzad16]

Resolved by #3679