Remove direct dependency on curl

[adlerjohn]

Fixes #567

1. Use the rustls-tls feature for reqwest and turn off default features (which would use native OpenSSL).
2. Use ureq instead of curl.

[adlerjohn]

openssl-sys is still required by fuel-gql-client, but is no longer required directly by forc:

$ cargo tree --invert openssl-sys
openssl-sys v0.9.72
├── curl v0.4.42
│   └── isahc v0.9.14
│       └── http-client v6.5.1
│           └── surf v2.3.2
│               ├── cynic v0.14.1
│               │   └── fuel-gql-client v0.1.2
│               │       └── forc v0.2.1 (/home/devel/local/fuellabs/sway/forc)
│               │           └── test v0.2.1 (/home/devel/local/fuellabs/sway/test)
│               └── fuel-gql-client v0.1.2 (*)
└── curl-sys v0.4.52+curl-7.81.0
    ├── curl v0.4.42 (*)
    └── isahc v0.9.14 (*)

Filed follow-up issue: FuelLabs/fuel-core#133

[leviathanbeak]

are we ok with having two http clients? one blocking (ureq) and the other non-blocking (reqwest)

[adlerjohn]

are we ok with having two http clients? one blocking (ureq) and the other non-blocking (reqwest)

Prior to this PR, curl was used. So the PR doesn't increase the number of clients compared to the status quo. Longer-terms, it's probably a good idea to use non-blocking reqwest for everything. Would involve a larger refactor of these functions.

[digorithm]

LGTM!

[adlerjohn]

Will wait for @sezna