[Mzack9999]

Closes #569

Proposed changes

• For a custom provider with a JSON body (a JSON Content-Type header, or a custom_format that starts with { or [), {{data}} and custom_sprig values written inside a JSON string are JSON-escaped.
• Values used outside a JSON string, and non-JSON formats, are sent unchanged.
• README note on the new behavior.

Proof

New tests TestCustomFormatDataInJSONStringIsEscaped, TestCustomSprigValuesInJSONStringAreEscaped, TestCustomFormatRawDataIsForwarded, TestCustomFormatWithoutJSONIsUnchanged and TestInJSONString. pkg/providers/custom tests pass.

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