Add Parquet roundtrip benchmarks (#8956)

# Which issue does this PR close?

- Closes #8955.

# Rationale for this change

Baseline for future improvements.

# What changes are included in this PR?

Adds new benchmarks for reading and writing. Currently uses a fixed
number of row groups, pages, and rows. Cycles through data types and
encodings.

# Are these changes tested?
N/A

# Are there any user-facing changes?

No

Author: etseidl

parquet/Cargo.toml

@@ -255,6 +255,11 @@ harness = false
 name = "metadata"
 harness = false
 
+[[bench]]
+name = "parquet_round_trip"
+required-features = ["arrow"]
+harness = false
+
 [[bench]]
 name = "row_selector"
 harness = false