Create Benchmarks For 2.x #24

We do not have extensive benchmarks around the encoding and decoding of tiles in the 2.x branch currently. The following are good benchmarks that we could have:

Decode:

• point
• multipoint
• linestring
• multi linestring
• polygon
• multi polygon

Encode:

• point
• multipoint
• linestring
• multi linestring
• polygon
• multi polygon

/cc @GretaCB