DEV: add PipeSeparatedValue and EscapedJson support

[RandySun228]

Motivation

The eBay payments (BES) accounting layer emits event payloads in two formats that EJMask could not previously mask:

1. Escaped JSON — JSON serialized as a string value inside a containing JSON document, where every quote character appears as ". The existing JsonFullValuePatternBuilder cannot handle this because its regex does not account for the backslash before each quote delimiter.
2. Pipe-separated key=value — a flat record format (e.g. the decodePayload field) where fields are delimited by |.

Proposed Changes

• EscapedJsonFullValuePatternBuilder (new, ejmask-extensions/builder/json): fully masks field values in escaped JSON strings.
  • "cvv":"sensitiveData" → "cvv":"****"
• PipeSeparatedValuePatternBuilder (new, ejmask-extensions/builder/string): fully masks field values in pipe-separated payloads.
  • userId=1083849182|type=SELLER → userId=****|type=SELLER
  • Value character class excludes " and \ so replacement is safe when the payload is embedded inside a JSON string.
• Unit tests for both builders aligned with existing project conventions (parameterized @MethodSource, exact pattern/replacement assertions).
• README updated with usage examples and builder table entries.

Test Plan

• EscapedJsonFullValuePatternBuilderTest: 7 tests — normal masked, empty value (unchanged), non-sensitive field (unchanged), field name appearing in value only (unchanged), JSON-embedded payload.
• PipeSeparatedValuePatternBuilderTest: 8 tests — value before pipe, value at end of string, multiple sensitive fields, adjacent field preserved, unrelated fields unchanged, JSON-embedded payload.
• All 15 tests pass: mvn test -pl ejmask-extensions

[Copilot]

Pull request overview

Adds two new regex pattern builders to the ejmask-extensions module to support masking in (1) escaped-JSON strings and (2) pipe-separated key=value payloads, and documents/validates usage via new unit tests and README updates.

Changes:

• Introduces EscapedJsonFullValuePatternBuilder for masking values inside escaped JSON (e.g., {\"cvv\":\"...\"}).
• Introduces PipeSeparatedValuePatternBuilder for masking values in pipe-delimited key=value strings.
• Updates README and adds JUnit tests covering the new builders’ regex + replacement behavior.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
README.md	Documents the two new builders and provides usage examples.
ejmask-extensions/src/main/java/com/ebay/ejmask/extenstion/builder/json/EscapedJsonFullValuePatternBuilder.java	Adds a builder to mask values in escaped-JSON strings.
ejmask-extensions/src/main/java/com/ebay/ejmask/extenstion/builder/string/PipeSeparatedValuePatternBuilder.java	Adds a builder to mask values in pipe-separated key=value payloads.
ejmask-extensions/src/test/java/com/ebay/ejmask/extenstion/builder/json/EscapedJsonFullValuePatternBuilderTest.java	Adds unit tests for the escaped-JSON builder.
ejmask-extensions/src/test/java/com/ebay/ejmask/extenstion/builder/string/PipeSeparatedValuePatternBuilderTest.java	Adds unit tests for the pipe-separated builder.

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.