Report IAST metrics via telemetry

[iunanua]

What does this PR do?

When the DD_TELEMETRY_METRICS_ENABLED environment variable is true, iast related information is recollected to send it to the backend.
Here is information related related with the request, that is sent when the request ends, and other information is send as global metrics periodically.

Plugin Checklist

• Unit tests.

Additional Notes

Even if this is a large PR, the changes out of the appsec directory are few.

• packages/dd-trace/src/config.js: To read new DD_TELEMETRY_METRICS_ENABLED and DD_IAST_TELEMETRY_VERBOSITY configurations.
• packages/dd-trace/src/telemetry/metrics.js: Prevent sending namespace information when the namespace hasn't anything to send.

[pr-commenter]

Benchmarks

Benchmark execution time: 2023-07-11 06:54:35

Comparing candidate commit 1d0ce27 in PR branch igor/iast_telemetry with baseline commit 3a2347c in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 461 metrics, 31 unstable metrics.

[github-actions]

Overall package size

Self size: 4.87 MB
Deduped: 57.85 MB
No deduping: 57.95 MB

Dependency sizes

name	version	self size	total size
@datadog/native-iast-taint-tracking	1.5.0	14.86 MB	14.86 MB
@datadog/native-appsec	3.2.0	13.38 MB	13.39 MB
@datadog/pprof	3.0.0	10.54 MB	11.39 MB
protobufjs	7.2.4	2.74 MB	6.52 MB
@datadog/native-iast-rewriter	2.0.1	2.09 MB	2.1 MB
@opentelemetry/core	1.14.0	872.87 kB	1.47 MB
@datadog/native-metrics	2.0.0	898.77 kB	1.3 MB
@opentelemetry/api	1.4.1	780.32 kB	780.32 kB
msgpack-lite	0.1.26	201.16 kB	281.59 kB
opentracing	0.14.7	194.81 kB	194.81 kB
semver	7.5.3	93.39 kB	123.79 kB
@datadog/sketches-js	2.1.0	109.9 kB	109.9 kB
lodash.sortby	4.7.0	75.76 kB	75.76 kB
lru-cache	7.14.0	74.95 kB	74.95 kB
ipaddr.js	2.0.1	59.52 kB	59.52 kB
int64-buffer	0.1.10	49.18 kB	49.18 kB
ignore	5.2.0	48.87 kB	48.87 kB
import-in-the-middle	1.3.5	34.34 kB	38.81 kB
istanbul-lib-coverage	3.2.0	29.34 kB	29.34 kB
retry	0.10.1	27.44 kB	27.44 kB
lodash.uniq	4.5.0	25.01 kB	25.01 kB
limiter	1.1.5	23.17 kB	23.17 kB
lodash.kebabcase	4.1.1	17.75 kB	17.75 kB
lodash.pick	4.4.0	16.33 kB	16.33 kB
node-abort-controller	3.0.1	14.33 kB	14.33 kB
crypto-randomuuid	1.0.0	11.18 kB	11.18 kB
diagnostics_channel	1.1.0	7.07 kB	7.07 kB
path-to-regexp	0.1.7	6.78 kB	6.78 kB
koalas	1.0.2	6.47 kB	6.47 kB
methods	1.1.2	5.29 kB	5.29 kB
module-details-from-path	1.0.3	4.47 kB	4.47 kB

_{🤖 This report was automatically generated by heaviest-objects-in-the-universe}

[codecov]

Codecov Report

Merging #2805 (1d0ce27) into master (3a2347c) will increase coverage by 0.51%.
The diff coverage is 97.68%.

@@            Coverage Diff             @@
##           master    #2805      +/-   ##
==========================================
+ Coverage   84.09%   84.60%   +0.51%     
==========================================
  Files         204      211       +7     
  Lines        8017     8252     +235     
  Branches       33       33              
==========================================
+ Hits         6742     6982     +240     
+ Misses       1275     1270       -5     

Impacted Files	Coverage Δ
...ppsec/iast/analyzers/command-injection-analyzer.js	100.00% <ø> (ø)
...c/appsec/iast/analyzers/ldap-injection-analyzer.js	100.00% <ø> (ø)
...d-trace/src/appsec/iast/analyzers/ssrf-analyzer.js	100.00% <ø> (ø)
.../src/appsec/iast/analyzers/weak-cipher-analyzer.js	100.00% <ø> (ø)
...ce/src/appsec/iast/analyzers/weak-hash-analyzer.js	100.00% <ø> (ø)
packages/dd-trace/src/appsec/iast/tags.js	100.00% <ø> (ø)
...race/src/appsec/iast/taint-tracking/csi-methods.js	100.00% <ø> (ø)
...ace/src/appsec/iast/taint-tracking/source-types.js	100.00% <ø> (ø)
...s/dd-trace/src/appsec/iast/telemetry/namespaces.js	89.65% <89.65%> (ø)
...d-trace/src/appsec/iast/taint-tracking/rewriter.js	94.87% <93.75%> (+0.75%)	⬆️
... and 20 more

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more