Minimize features (#1399)

* Turn off default features of ahash as they're not needed

The default feature set of the ahash crate is ["std"][1]. The std
feature enables features which require the standard library, namely
`AHashMap` and `AHashSet`. DataFusion currently only uses `AHasher`,
`CallHasher`, and `RandomState`, none of which require the standard
library.

This gives more control to projects depending on datafusion to minimize
the amount of code they depend on.

[1]: https://github.com/tkaitchuck/aHash/blob/e77cab8c1e15bfc9f54dfd28bd8820c2a7bb27c4/Cargo.toml#L24-L25

* Turn off default features of chrono as they're not needed

In fact, the "oldtime" feature is [considered deprecated][1] and only
included by default for backwards compatibility.

The other features don't appear to be used by datafusion or
ballista, so this gives projects depending on these crates more
flexibility in what they choose to include.

[1]: https://github.com/chronotope/chrono/blame/f6bd567bb677262645c1fc3131c8c1071cd77ec3/README.md#L88-L94

ballista/rust/core/Cargo.toml

@@ -30,7 +30,7 @@ build = "build.rs"
 simd = ["datafusion/simd"]
 
 [dependencies]
-ahash = "0.7"
+ahash = { version = "0.7", default-features = false }
 async-trait = "0.1.36"
 futures = "0.3"
 hashbrown = "0.11"
@@ -41,7 +41,7 @@ sqlparser = "0.13"
 tokio = "1.0"
 tonic = "0.5"
 uuid = { version = "0.8", features = ["v4"] }
-chrono = "0.4"
+chrono = { version = "0.4", default-features = false }
 
 arrow-flight = { version = "6.4.0"  }
 

datafusion/Cargo.toml

@@ -50,14 +50,14 @@ force_hash_collisions = []
 avro = ["avro-rs", "num-traits"]
 
 [dependencies]
-ahash = "0.7"
+ahash = { version = "0.7", default-features = false }
 hashbrown = { version = "0.11", features = ["raw"] }
 arrow = { version = "6.4.0", features = ["prettyprint"] }
 parquet = { version = "6.4.0", features = ["arrow"] }
 sqlparser = "0.13"
 paste = "^1.0"
 num_cpus = "1.13.0"
-chrono = "0.4"
+chrono = { version = "0.4", default-features = false }
 async-trait = "0.1.41"
 futures = "0.3"
 pin-project-lite= "^0.2.7"