feat(tui-big-text)!: make `BigText` builder infallible #18

Job	Run time
test / ubuntu / stable / coverage	43s
test / ubuntu / stable / minimal-versions	41s
test / macos-latest / stable	32s
test / windows-latest / stable	3m 19s
test / ubuntu / stable	26s
test / ubuntu / beta	31s
	6m 12s

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