[POC] Allow clients to specify set TLS specifications per-request

[jrhee17]

Motivation:

Explain why you're making this change and what problem you're trying to solve.

Modifications:

• List the modifications you've made in detail.

Result:

• Closes #<GitHub issue number>. (If this resolves the issue.)
• Describe the consequences that a user will face after this PR is merged.

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[github-actions[bot]]

🔍 Build Scan® (commit: 4ae8b6a027705204c665ffef31d20135f834a4f7)

Job name	Status	Build Scan®
build-ubicloud-standard-16-jdk-8	✅	https://ge.armeria.dev/s/evwvkqmdclan6
build-ubicloud-standard-16-jdk-25	✅	https://ge.armeria.dev/s/rsgag3x5pcnrw
build-ubicloud-standard-16-jdk-21-snapshot-blockhound	✅	https://ge.armeria.dev/s/kiikgstwduwpi
build-ubicloud-standard-16-jdk-17-min-java-17-coverage	✅	https://ge.armeria.dev/s/3b6w2tt2pzrjg
build-ubicloud-standard-16-jdk-17-min-java-11	✅	https://ge.armeria.dev/s/ysylmtep57epc
build-ubicloud-standard-16-jdk-17-leak	✅	https://ge.armeria.dev/s/63cr72ww7drmg
build-ubicloud-standard-16-jdk-11	✅	https://ge.armeria.dev/s/gtzjf6synnx42
build-macos-latest-jdk-25	✅	https://ge.armeria.dev/s/46oh3c5kp3q7u

[codecov[bot]]

Codecov Report

:x: Patch coverage is 75.94502% with 70 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 74.27%. Comparing base (8150425) to head (4ae8b6a). :warning: Report is 284 commits behind head on main.

Files with missing lines	Patch %	Lines
...om/linecorp/armeria/client/DefaultSslContexts.java	0.00%	30 Missing :warning:
...ava/com/linecorp/armeria/server/ServerTlsSpec.java	70.27%	6 Missing and 5 partials :warning:
.../linecorp/armeria/server/VirtualHostTlsSetter.java	86.04%	1 Missing and 5 partials :warning:
...p/armeria/internal/common/util/SslContextUtil.java	87.80%	2 Missing and 3 partials :warning:
...om/linecorp/armeria/server/VirtualHostBuilder.java	87.87%	2 Missing and 2 partials :warning:
...linecorp/armeria/client/DefaultRequestOptions.java	66.66%	2 Missing :warning:
...a/client/FutureTransformingRequestPreparation.java	0.00%	2 Missing :warning:
...linecorp/armeria/client/RestClientPreparation.java	0.00%	2 Missing :warning:
...armeria/client/TransformingRequestPreparation.java	0.00%	2 Missing :warning:
...orp/armeria/internal/common/SslContextFactory.java	95.55%	0 Missing and 2 partials :warning:
... and 3 more

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6516      +/-   ##
============================================
- Coverage     74.46%   74.27%   -0.19%     
- Complexity    22234    23560    +1326     
============================================
  Files          1963     2117     +154     
  Lines         82437    88192    +5755     
  Branches      10764    11543     +779     
============================================
+ Hits          61385    65508    +4123     
- Misses        15918    17183    +1265     
- Partials       5134     5501     +367     

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