7904059: Enable alternative Runner instantiation and Main reuse

[galderz]

This is the third in a series of PRs that I will be sending over the next few days, which make extending JMH to benchmark Java code running as GraalVM native images more easily. The codename for this extension is Fibula. It can still work without this PRs but without them the extension has to duplicate code that exists in JMH, which is not desirable.

This PR refactors the main class to enable reuse of most of its logic, while allowing the construction of the Runner instance to be overridden by a subclass. An example of this override can be seen here.

Here is the PR list for reference:

1. Make OutputFormatAdapter public
2. Enable BenchmarkParams construction to be overriden
3. Enable alternative Runner instantiation and Main reuse
4. Enable profiler classes to be reused outside of JMH
5. Enable JMH integration tests to be executed against other impls

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Progress

• Change must not contain extraneous whitespace
• Change must be properly reviewed (1 review required, with at least 1 Committer)

Issue

• CODETOOLS-7904059: Enable alternative Runner instantiation and Main reuse (Enhancement - P4)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jmh.git pull/161/head:pull/161
$ git checkout pull/161

Update a local copy of the PR:
$ git checkout pull/161
$ git pull https://git.openjdk.org/jmh.git pull/161/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 161

View PR using the GUI difftool:
$ git pr show -t 161

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jmh/pull/161.diff

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[bridgekeeper]

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[openjdk]

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See the Progress checklist in the description for automated requirements.

[mlbridge]

Webrevs

• 00: Full (a9a8184f)