Support mustache templates in all `string` fields `generate::config`

[tusharmath]

Config should support mustache templates everywhere there is a "String" type.

Technical Requirements

• Templates should be able to resolve env variables.

Before

inputs:
- curl:
    src: https://example.com
    headers:
      user-agent: tailcall-v1
    fieldName: test
output: {}
schema: {}

After

inputs:
- curl:
    src: https://example.com
    headers:
      user-agent: "{{.env.USER}}"
    fieldName: test
output: {}
schema: {}
preset:
  inferTypeNames: true

[tusharmath]

/bounty 50$

[algora-pbc[bot]]

💎 $50 bounty • Tailcall Inc.

Steps to solve:

1. Start working: Comment /attempt #2646 with your implementation plan
2. Submit work: Create a pull request including /claim #2646 in the PR body to claim the bounty
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Attempt	Started (GMT+0)	Solution
🟢 @dekkku	Aug 11, 2024, 7:51:59 AM	WIP
🟢 @ssddOnTop		#2657

[dekkku]

/attempt #2646

Algora profile	Completed bounties	Tech	Active attempts	Options
@dekkku	2 tailcallhq bounties	Rust		Cancel attempt

[algora-pbc[bot]]

💡 @ssddOnTop submitted a pull request that claims the bounty. You can visit your bounty board to reward.

[algora-pbc[bot]]

🎉🎈 @ssddOnTop has been awarded $50! 🎈🎊

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