[LinZhihao-723]

Description

This PR adds an .editorconfig to exports/lint-configs so that editors apply the same basic whitespace and line-length rules our formatters and linters enforce, before any of those tools run.

Each setting is derived from the existing configs:

Setting	Value	Source
charset	utf-8	Default encoding for C++/Rust/Python/YAML sources.
end_of_line	lf	.clang-format (LineEnding: LF), .rustfmt.toml (newline_style = "Unix"), yamllint's default new-lines rule.
indent_style	space	.clang-format (UseTab: Never), markdownlint MD010.
indent_size	4	.clang-format (IndentWidth: 4), .rustfmt.toml (tab_spaces = 4), Ruff's default indent width.
tab_width	4	.clang-format (TabWidth: 4), markdownlint MD010 (spaces_per_tab: 4).
insert_final_newline	true	.clang-format (InsertNewlineAtEOF: true), yamllint's default new-line-at-end-of-file rule.
trim_trailing_whitespace	true	markdownlint MD009 (strict: true), yamllint's default trailing-spaces rule.
max_line_length	100	.clang-format (ColumnLimit), .rustfmt.toml (max_width), Ruff (line-length), markdownlint MD013, yamllint line-length.

Overrides:

• YAML files (*.yaml, *.yml, and the extension-less YAML configs .clang-format, .clang-tidy, and .yamllint) use indent_size = 2, following yamllint's indentation.spaces: 2.
• Markdown files use indent_size = 2, following markdownlint's default MD007 list indentation.

The file sets root = true since EditorConfig doesn't support extending a config from another path; similar to .clang-format and .clang-tidy, projects are expected to symlink it into their root directory.

Checklist

• The PR satisfies the contribution guidelines.
• This is a breaking change and that has been indicated in the PR title, OR this isn't a
  breaking change.
• Necessary docs have been updated, OR no docs need to be updated.

Validation performed

• Resolved the properties for sample paths (.cpp, .hpp, .rs, .py, .sh, .toml, .md, .yaml, .yml, .clang-format, .clang-tidy, .yamllint) using the reference EditorConfig core (EditorConfig 0.17.1) and confirmed each path gets the expected values. Also confirmed that paths such as foo.clang-format and .clang-tidy.bak don't match the YAML section.
• Ran editorconfig-checker (v3.11.1) against a copy of this repo with the file placed at the root. No reported violation indicates an incorrect setting; the reports are either pre-existing issues in the repo (e.g., CRLF line endings in exports/lint-configs/lint-requirements.txt, a missing final newline in taskfiles/boost/.clang-format) or expected false positives (e.g., the centered layout of LICENSE, 3-space continuation indents under ordered Markdown list items, and clang-format's operand alignment).
• Confirmed both overrides are necessary: removing the YAML section causes every YAML file in the repo to be flagged, and removing the Markdown section flags the 2-space nested list items in the repo's docs.

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