Add 'perf' feature flag on regex crate (#11239)

Our grok crate is unusual. We use regex in certain places like date parsing and
onig when dealing with the grok patterns themselves. Work on #11206 strongly
suggests that if sinks are allowed to run less subject to slow receiver issue
then `apply_date_filter` is a CPU hotspot. As suggested by @tobz we enable the
'perf' flags to the regex crate, which features heavily in the implementation of
that function.

Signed-off-by: Brian L. Troutwine <brian@troutwine.us>

lib/datadog/grok/Cargo.toml

@@ -17,7 +17,7 @@ once_cell = { version = "1.9", default-features = false, features = ["std", "par
 onig = { version = "6.3", default-features = false }
 ordered-float = { version = "2", default-features = false }
 peeking_take_while = { version = "1.0.0", default-features = false }
-regex = { version = "1", default-features = false }
+regex = { version = "1.5", default-features = false, features = ["perf"] }
 serde = { version = "1.0.136", default-features = false  }
 serde_json = { version = "1.0.78", default-features = false }
 strum_macros = { version = "0.23", default-features = false }

lib/vrl/cli/Cargo.toml

@@ -16,7 +16,7 @@ exitcode = "1"
 indoc = "1.0.3"
 once_cell = { version = "1.9", optional = true }
 prettytable-rs = { version = "0.8", default-features = false, optional = true }
-regex = { version = "1", default-features = false, optional = true }
+regex = { version = "1", default-features = false, optional = true, features = ["perf"] }
 rustyline = { version = "9", default-features = false, optional = true }
 serde_json = "1"
 structopt = { version = "0.3", default-features = false }