[GH-2678] Add SVG visuals for overlay functions (Phase 2)

[jiayuasu]

Did you read the Contributor Guide?

• Yes, I have read the Contributor Rules and Contributor Development Guide

Is this PR related to a ticket?

• Yes, and the PR name follows the format [GH-XXX] my subject. Closes Sedona doc should have visuals for individual function to illustrate #2678

What changes were proposed in this PR?

Added SVG visual illustrations for 7 overlay functions (Phase 2 of #2678):

• ST_Intersection, ST_Union, ST_Difference, ST_SymDifference
• ST_Split, ST_SubDivide (also used by ST_SubDivideExplode), ST_UnaryUnion

Each overlay function gets one SVG showing input geometries (A and B in dashed outline) with the result region highlighted in green. For single-geometry functions (ST_SubDivide, ST_UnaryUnion), only geometry A is shown.

SVG files stored in docs/image/ST_Name/. Images embedded in 22 markdown files across:

• docs/api/sql/Overlay-Functions/
• docs/api/flink/Overlay-Functions/
• docs/api/snowflake/vector-data/Overlay-Functions/

How was this patch tested?

• Verified all 7 SVG files exist and render correctly
• Verified all image references in 22 markdown files resolve to existing files (no broken links)
• Visual inspection of SVG output

Did this PR include necessary documentation updates?

• Yes, I have updated the documentation.

[Copilot]

Pull request overview

Adds Phase 2 visual documentation for Sedona overlay functions by introducing new SVG illustrations and embedding them into the SQL, Flink, and Snowflake function reference pages (per #2678).

Changes:

• Added 7 new SVG diagrams illustrating inputs (A/B) and the result region for overlay operations.
• Embedded these SVGs into 22 overlay-function Markdown docs across SQL, Flink, and Snowflake sections.
• Reused the ST_SubDivide SVG for the ST_SubDivideExplode docs.

Reviewed changes

Copilot reviewed 22 out of 29 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
docs/image/ST_Union/ST_Union.svg	New SVG illustrating ST_Union(A, B) result region
docs/image/ST_UnaryUnion/ST_UnaryUnion.svg	New SVG illustrating ST_UnaryUnion(A) result region
docs/image/ST_SymDifference/ST_SymDifference.svg	New SVG illustrating ST_SymDifference(A, B) result region
docs/image/ST_SubDivide/ST_SubDivide.svg	New SVG illustrating ST_SubDivide(A, maxVertices) result regions
docs/image/ST_Split/ST_Split.svg	New SVG illustrating ST_Split(A, blade) result regions
docs/image/ST_Intersection/ST_Intersection.svg	New SVG illustrating ST_Intersection(A, B) result region
docs/image/ST_Difference/ST_Difference.svg	New SVG illustrating ST_Difference(A, B) result region
docs/api/sql/Overlay-Functions/ST_Union.md	Embed ST_Union SVG in SQL docs
docs/api/sql/Overlay-Functions/ST_UnaryUnion.md	Embed ST_UnaryUnion SVG in SQL docs
docs/api/sql/Overlay-Functions/ST_SymDifference.md	Embed ST_SymDifference SVG in SQL docs
docs/api/sql/Overlay-Functions/ST_SubDivideExplode.md	Embed ST_SubDivide SVG (reused) for ST_SubDivideExplode in SQL docs
docs/api/sql/Overlay-Functions/ST_SubDivide.md	Embed ST_SubDivide SVG in SQL docs
docs/api/sql/Overlay-Functions/ST_Split.md	Embed ST_Split SVG in SQL docs
docs/api/sql/Overlay-Functions/ST_Intersection.md	Embed ST_Intersection SVG in SQL docs
docs/api/sql/Overlay-Functions/ST_Difference.md	Embed ST_Difference SVG in SQL docs
docs/api/snowflake/vector-data/Overlay-Functions/ST_Union.md	Embed ST_Union SVG in Snowflake docs
docs/api/snowflake/vector-data/Overlay-Functions/ST_UnaryUnion.md	Embed ST_UnaryUnion SVG in Snowflake docs
docs/api/snowflake/vector-data/Overlay-Functions/ST_SymDifference.md	Embed ST_SymDifference SVG in Snowflake docs
docs/api/snowflake/vector-data/Overlay-Functions/ST_SubDivideExplode.md	Embed ST_SubDivide SVG (reused) for ST_SubDivideExplode in Snowflake docs
docs/api/snowflake/vector-data/Overlay-Functions/ST_SubDivide.md	Embed ST_SubDivide SVG in Snowflake docs
docs/api/snowflake/vector-data/Overlay-Functions/ST_Split.md	Embed ST_Split SVG in Snowflake docs
docs/api/snowflake/vector-data/Overlay-Functions/ST_Intersection.md	Embed ST_Intersection SVG in Snowflake docs
docs/api/snowflake/vector-data/Overlay-Functions/ST_Difference.md	Embed ST_Difference SVG in Snowflake docs
docs/api/flink/Overlay-Functions/ST_Union.md	Embed ST_Union SVG in Flink docs
docs/api/flink/Overlay-Functions/ST_UnaryUnion.md	Embed ST_UnaryUnion SVG in Flink docs
docs/api/flink/Overlay-Functions/ST_SymDifference.md	Embed ST_SymDifference SVG in Flink docs
docs/api/flink/Overlay-Functions/ST_SubDivide.md	Embed ST_SubDivide SVG in Flink docs
docs/api/flink/Overlay-Functions/ST_Intersection.md	Embed ST_Intersection SVG in Flink docs
docs/api/flink/Overlay-Functions/ST_Difference.md	Embed ST_Difference SVG in Flink docs

Comments suppressed due to low confidence (1)

docs/api/snowflake/vector-data/Overlay-Functions/ST_SubDivideExplode.md:32

• The Markdown around the "Format" / example SQL block has mismatched backticks ("Format: `" on line 28 and a closing backtick at the end of the SELECT on line 32). This renders the section incorrectly and can swallow subsequent content. Please convert this to a proper inline code span (for the format string) and/or a fenced code block for the SQL example, with balanced backticks.

Format: `
Return type: `Geometry`

SELECT SEDONA.ST_AsText(GEOM)
FROM table(SEDONA.ST_SubDivideExplode(geom: geometry, maxVertices: int))`

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