tgc-revival: split the flatten_property_method.go.tmpl template

[zli82016]

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[modular-magician]

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terraform-google-conversion	View Diff	196 files changed, 3122 insertions(+), 17439 deletions(-)

[modular-magician]

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terraform-google-conversion	View Diff	197 files changed, 35404 insertions(+), 41013 deletions(-)

[modular-magician]

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terraform-google-conversion	View Diff	101 files changed, 113 insertions(+)

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes for commit 4031976:

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terraform-google-conversion	View Diff	42 files changed, 4 insertions(+), 45 deletions(-)

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes for commit 41147e2:

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terraform-google-conversion	View Diff	101 files changed, 113 insertions(+)