feat: initialize azure-acme-provisioner project with core functionality

- Add package.json for project metadata and dependencies
- Implement CLI in src/cli.ts for managing SSL/TLS certificates
- Create Azure Functions host configuration in src/function/host.json
- Set up timer function in src/function/index.ts for scheduled certificate management
- Define configuration loading and error handling in src/lib/config.ts
- Implement DNS zone scanning and challenge management in src/lib/dns.ts
- Develop ACME client for certificate issuance in src/lib/acme.ts
- Create KeyVault store for managing secrets and certificates in src/lib/keyvault.ts
- Implement provisioning logic in src/lib/provisioner.ts for issuing and renewing certificates
- Add TypeScript configuration files for building the project

src/index.ts

@@ -0,0 +1,13 @@
+export { loadConfig, ConfigError } from './lib/config.js';
+export type { Config } from './lib/config.js';
+
+export { KeyVaultStore } from './lib/keyvault.js';
+
+export { scanDnsZones, DnsChallengeManager } from './lib/dns.js';
+export type { DomainRecord } from './lib/dns.js';
+
+export { AcmeClient } from './lib/acme.js';
+export type { IssuedCertificate } from './lib/acme.js';
+
+export { Provisioner, domainToCertName } from './lib/provisioner.js';
+export type { ProvisioningResult } from './lib/provisioner.js';