fix: Use jamm as ObjectSizeCalculator dropped

[anssit]

Description

ObjectSizeCalculator used in memory measurement tests was removed in JDK9. To run the tests on JDK11, an alternative memory measurement tool was needed.

This PR replaces ObjectSizeCalculator with "Java Agent for Memory Measurements", jamm.

Type of change

• [x] Bugfix
• [ ] Feature

Checklist

• [x] I have read the contribution guide: https://vaadin.com/docs/latest/guide/contributing/overview/
• [x] I have added a description following the guideline.
• [ ] The issue is created in the corresponding repository and I have referenced it.
• [ ] I have added tests to ensure my change is effective and works as intended.
• [x] New and existing tests are passing locally with my change.
• [x] I have performed self-review and corrected misspellings.

[anssit]

The default G1 garbage collector in Java 11 seems to cause unstable results. Using the Parallel collector (JDK8 default) gives similar results as previously. Data from local test runs:

Java8, ObjectSizeCalculator
- Test run length 30 min 
    - ##teamcity[buildStatisticValue key='list' value='76684']
    - ##teamcity[buildStatisticValue key='editor' value='135488']
    - ##teamcity[buildStatisticValue key='analytics' value='14708']
- 8 min 30 s
    - ##teamcity[buildStatisticValue key='list' value='81376']
    - ##teamcity[buildStatisticValue key='editor' value='138080']
    - ##teamcity[buildStatisticValue key='analytics' value='18304']
- 11 min 30 s
    - ##teamcity[buildStatisticValue key='list' value='81936']
    - ##teamcity[buildStatisticValue key='editor' value='133472']
    - ##teamcity[buildStatisticValue key='analytics' value='16470']
- 12 min
    - ##teamcity[buildStatisticValue key='list' value='80560']
    - ##teamcity[buildStatisticValue key='editor' value='138296']
    - ##teamcity[buildStatisticValue key='analytics' value='19078']
- 16 min
    - ##teamcity[buildStatisticValue key='list' value='81376']
    - ##teamcity[buildStatisticValue key='editor' value='138304']
    - ##teamcity[buildStatisticValue key='analytics' value='13932']

Java8, JAMM
- 12 min
    - ##teamcity[buildStatisticValue key='list' value='81392']
    - ##teamcity[buildStatisticValue key='editor' value='134032']
    - ##teamcity[buildStatisticValue key='analytics' value='13352']
- 7 min
    - ##teamcity[buildStatisticValue key='list' value='81928']
    - ##teamcity[buildStatisticValue key='editor' value='138360']
    - ##teamcity[buildStatisticValue key='analytics' value='18800']
- 10 min 30 s
    - ##teamcity[buildStatisticValue key='list' value='87192']
    - ##teamcity[buildStatisticValue key='editor' value='139168']
    - ##teamcity[buildStatisticValue key='analytics' value='15489']

Java11, JAMM
- 28 min 30 s
    - ##teamcity[buildStatisticValue key='list' value='89652']
    - ##teamcity[buildStatisticValue key='editor' value='112276']
    - ##teamcity[buildStatisticValue key='analytics' value='4608']
- 32 min
    - ##teamcity[buildStatisticValue key='list' value='52430']
    - ##teamcity[buildStatisticValue key='editor' value='110254']
    - ##teamcity[buildStatisticValue key='analytics' value='3819']
- 29 min
    - ##teamcity[buildStatisticValue key='list' value='57812']
    - ##teamcity[buildStatisticValue key='editor' value='124518']
    - ##teamcity[buildStatisticValue key='analytics' value='6601']
- 27 min
    - ##teamcity[buildStatisticValue key='list' value='81000']
    - ##teamcity[buildStatisticValue key='editor' value='124870']
    - ##teamcity[buildStatisticValue key='analytics' value='52256'] -> FAIL!

Java11, JAMM, -XX:+UseParallelGC
- 25 min 
    - ##teamcity[buildStatisticValue key='list' value='79192']
    - ##teamcity[buildStatisticValue key='editor' value='130579']
    - ##teamcity[buildStatisticValue key='analytics' value='14443']
- 13 min 30 s
    - ##teamcity[buildStatisticValue key='list' value='80408']
    - ##teamcity[buildStatisticValue key='editor' value='136848']
    - ##teamcity[buildStatisticValue key='analytics' value='32606']
- 11 min
    - ##teamcity[buildStatisticValue key='list' value='79504']
    - ##teamcity[buildStatisticValue key='editor' value='135088']
    - ##teamcity[buildStatisticValue key='analytics' value='25955']
- 23 min
    - ##teamcity[buildStatisticValue key='list' value='80528']
    - ##teamcity[buildStatisticValue key='editor' value='136088']
    - ##teamcity[buildStatisticValue key='analytics' value='15764']