Add benchmarking for lambda functions with extension layer

[lahsivjar]

The PR adds code for benchmarking lambda functions (currently supports go1.x and python3.8 runtimes) with extension layer. The PR uses artillery for load generation and terraform for infra management.

How to run?

1. cd testing
2. LAMBDA_RUNTIME=go1.x EC_API_KEY=<ec_api_key> make bench

Sample report

--------------------------------
Summary report @ 06:53:39(+0000)
--------------------------------

http.codes.200: ................................... 500
http.request_rate: ................................ 50/sec
http.requests: .................................... 500
http.response_time:
  min: ............................................ 18
  max: ............................................ 4418
  median: ......................................... 89.1
  p95: ............................................ 4147.4
  p99: ............................................ 4316.6
http.responses: ................................... 500
vusers.completed: ................................. 500
vusers.created: ................................... 500
vusers.created_by_name.get: ....................... 500
vusers.failed: .................................... 0
vusers.session_length:
  min: ............................................ 29.8
  max: ............................................ 4431.3
  median: ......................................... 133
  p95: ............................................ 4231.1
  p99: ............................................ 4316.6
with-coldstart:
  min: ............................................ 3743
  max: ............................................ 4418
  median: ......................................... 3984.7
  p95: ............................................ 4231.1
  p99: ............................................ 4316.6
with-coldstart.codes.200: ......................... 228
without-coldstart:
  min: ............................................ 18
  max: ............................................ 184
  median: ......................................... 56.3
  p95: ............................................ 104.6
  p99: ............................................ 147
without-coldstart.codes.200: ...................... 272

[ghost]

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Build stats

• Start Time: 2022-11-04T07:47:17.923+0000

• Duration: 8 min 40 sec

Test stats 🧪

Test	Results
Failed	0
Passed	202
Skipped	2
Total	204

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[axw]

LGTM!