Fix cache architecture

[s-dwinter]

Overview

I fix cache architecture.
With this change, the cache will store each value, not the entire values.

Valification

I am verifyring thiat running the example with option. I have confirmed that the execution time changes on the second and subsequent runs.

# first
❯ time ./dist/ysr_darwin_arm64/ysr template -c ./example/yashiro.yaml --enable-cache --cache-dir ./tmp ./example/example.yaml.tmpl > /dev/null
./dist/ysr_darwin_arm64/ysr template -c ./example/yashiro.yaml --enable-cache  0.03s user 0.02s system 6% cpu 0.689 total

# cache created
❯ la ./tmp    
.6177735f61702d6e6f727468656173742d315f313635373636303234353135_keyHash
6177735f61702d6e6f727468656173742d315f313635373636303234353135_2f7961736869726f2f6578616d706c65
6177735f61702d6e6f727468656173742d315f313635373636303234353135_2f7961736869726f2f6578616d706c652f736563757265
6177735f61702d6e6f727468656173742d315f313635373636303234353135_key

# second
❯ time ./dist/ysr_darwin_arm64/ysr template -c ./example/yashiro.yaml --enable-cache --cache-dir ./tmp ./example/example.yaml.tmpl > /dev/null
./dist/ysr_darwin_arm64/ysr template -c ./example/yashiro.yaml --enable-cache  0.02s user 0.01s system 7% cpu 0.325 total

# third
❯ time ./dist/ysr_darwin_arm64/ysr template -c ./example/yashiro.yaml --enable-cache --cache-dir ./tmp ./example/example.yaml.tmpl > /dev/null
./dist/ysr_darwin_arm64/ysr template -c ./example/yashiro.yaml --enable-cache  0.02s user 0.01s system 6% cpu 0.354 total

# confirm cache
❯ cat ./tmp/6177735f61702d6e6f727468656173742d315f313635373636303234353135_2f7961736869726f2f6578616d706c65 
{"imageTag": "latest", "roleArn": "arn:aws:iam::012345678901:role/PodRole29A92600-1NSKGEZRCWPNU"}                                           

# encrypted secret value
❯ cat ./tmp/6177735f61702d6e6f727468656173742d315f313635373636303234353135_2f7961736869726f2f6578616d706c652f736563757265 
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