RFR: 8366716: Move SmapsParser from runtime/os/TestTracePageSizes.java into testlib [v5]

[jonghoonpark]

> related jira issue: https://bugs.openjdk.org/browse/JDK-8366716
> 
> ---
> 
> Following the direction outlined in the issue description,
> I've extracted the common parts from `TestTracePageSizes` and `TestTransparentHugePagesHeap` to implement the `SmapsParser` test library.
> 
> I've confirmed that it works without issues in my local tests.
> 
> Reviews and feedback are welcome.

jonghoonpark has updated the pull request incrementally with two additional commits since the last revision:

 - remove whitespace
   
   Signed-off-by: jonghoonpark <dev at jonghoonpark.com>
 - Apply suggestion from @kstefanj
   
   Co-authored-by: Stefan Johansson <54407259+kstefanj at users.noreply.github.com>

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/27273/files
  - new: https://git.openjdk.org/jdk/pull/27273/files/57b1dcaf..e82154fd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27273&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27273&range=03-04

  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/27273.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27273/head:pull/27273

PR: https://git.openjdk.org/jdk/pull/27273