feat：雨量等值面材料

src/assets/file/sample.txt

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+站名,经度,维度,雨量值
+大岙,121.582825,29.673212,60.0
+西城,121.770164,29.709620,46.0
+画龙,121.764189,29.764500,55.5
+涵玉,121.714960,29.831308,44.5
+华家山水库,121.660760,29.683490,54.0
+姜山,121.552728,29.769535,47.0
+甲岙岭水库,121.759380,29.676624,53.0
+莫枝堰,121.639850,29.804400,66.0

src/assets/json/330303.json

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