define HTTP_METHOD_STR as static const to save RAM

[craiglink]

Description of Change

defines constant array as to strings as static const so that it moves from RAM to Flash

Tests scenarios

I have tested this using Arduino-esp32 core v2.0.16 running FluidNC - http://wiki.fluidnc.com/

This should be cherry-picked into the v2.0.x branch

[CLAassistant]

All committers have signed the CLA.

[github-actions]

	Warnings
⚠️	Some issues found for the commit messages in this PR: the commit message "define HTTP_METHOD_STR as static const to save RAM": summary looks empty type/action looks empty Please fix these commit messages - here are some basic tips: follow Conventional Commits style correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test sufficiently descriptive message summary should be between 20 to 72 characters and start with upper case letter avoid Jira references in commit messages (unavailable/irrelevant for our customers) TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).
⚠️	The source branch "static-const-HTTP-Methods" incorrect format: contains uppercase letters. This can cause troubles on case-insensitive file systems (macOS). Please rename your branch.

👋 Hello craiglink, we appreciate your contribution to this project!

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