Use rewrite rules to combine transformation operations

[harendra-kumar]

We can combine operations such as:

• map/map
• drop/drop
• take/take
• filter/filter

[adithyaov]

Should be done for all the core players in the library,

• StreamD
• StreamK
• Fold (FoldD + FoldK TBD)
• Unfold (UnfoldD + UnfoldK TBD)
• ParserD
• ParserK

And for the types the user will be interfacing with,

• SerialT
• AsyncT
• AheadT
• Parser
• Fold
• Unfold