docs: clarifying that ESM support is experimental

[tlhunter]

What does this PR do?

• clarify that ESM is experimental

Motivation

• recent user questions about ESM

[github-actions]

Overall package size

Self size: 3.99 MB
Deduped: 59.58 MB
No deduping: 59.62 MB

Dependency sizes

name	version	self size	total size
@datadog/native-iast-taint-tracking	1.3.1	13.47 MB	13.47 MB
@datadog/pprof	2.1.0	12.31 MB	13.2 MB
@datadog/native-appsec	2.0.0	12.33 MB	12.34 MB
@datadog/native-metrics	1.5.0	7.1 MB	7.11 MB
protobufjs	7.1.2	2.76 MB	6.55 MB
@datadog/native-iast-rewriter	2.0.1	2.09 MB	2.1 MB
opentracing	0.14.7	194.81 kB	194.81 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
semver	5.7.1	61.58 kB	61.58 kB
ipaddr.js	2.0.1	59.52 kB	59.52 kB
ignore	5.2.0	48.87 kB	48.87 kB
import-in-the-middle	1.3.4	32.7 kB	37.17 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 #2954 (c0bbb8f) into master (148a8c7) will increase coverage by 1.55%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2954      +/-   ##
==========================================
+ Coverage   87.60%   89.15%   +1.55%     
==========================================
  Files         327      272      -55     
  Lines       11720     9777    -1943     
  Branches       33       33              
==========================================
- Hits        10267     8717    -1550     
+ Misses       1453     1060     -393     

see 55 files with indirect coverage changes

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

[pr-commenter]

Benchmarks

Comparing candidate commit c0bbb8f in PR branch tlhunter/docs-experimental-esm with baseline commit 148a8c7 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 665 metrics, 43 unstable metrics.