[Feature]: let `ts-jest config:init` generate better pattern

[zjffun]

🚀 Feature Proposal

How about change

ts-jest/src/constants.ts

Lines 6 to 11 in 00eb6d2

	export const TS_TRANSFORM_PATTERN = '^.+\\.tsx?$'
	export const ESM_TS_TRANSFORM_PATTERN = '^.+\\.m?tsx?$'
	export const TS_JS_TRANSFORM_PATTERN = '^.+\\.[tj]sx?$'
	export const ESM_TS_JS_TRANSFORM_PATTERN = '^.+\\.m?[tj]sx?$'
	export const JS_TRANSFORM_PATTERN = '^.+\\.jsx?$'
	export const ESM_JS_TRANSFORM_PATTERN = '^.+\\.m?jsx?$'

to

export const TS_TRANSFORM_PATTERN = '^.+\\\\.tsx?$'
export const ESM_TS_TRANSFORM_PATTERN = '^.+\\\\.m?tsx?$'
export const TS_JS_TRANSFORM_PATTERN = '^.+\\\\.[tj]sx?$'
export const ESM_TS_JS_TRANSFORM_PATTERN = '^.+\\\\.m?[tj]sx?$'
export const JS_TRANSFORM_PATTERN = '^.+\\\\.jsx?$'
export const ESM_JS_TRANSFORM_PATTERN = '^.+\\\\.m?jsx?$'

because ejs will not output the escaped \

Motivation

Current generated pattern will cause Unnecessary escape character

Reproduction: https://ionicabizau.github.io/ejs-playground/

OK, so have fun! :D
-------------------
<%
    const TS_TRANSFORM_PATTERN = '^.+\\.tsx?$'
%>

<%= TS_TRANSFORM_PATTERN %>