Fetch supported instance types and pricing

[a7i]

Currently all supported instance types are hard-coded and this causes issues in regions that may not support a particular instance type.

Moreover, pricing can vary based on regions.

/cc @uray-10

[uray-10]

An error occurred (ClientException) when calling the CreateComputeEnvironment operation: Error executing request, Exception : Instance type can only be one of [r3, r4, m6g.xlarge, r5, optimal, r5d.24xlarge, m5n, r4.16xlarge, r5a.2xlarge, c6g.4xlarge, x2gd.medium, m6gd.xlarge, m5.xlarge, c5a.2xlarge, r6g.4xlarge, r6g.16xlarge, i3.4xlarge, x2gd.2xlarge, z1d.3xlarge, m5n.24xlarge, a1.medium, c6gd.12xlarge, r5b.16xlarge, m5.large, c5d.large, m6g.2xlarge, m5dn.2xlarge, m6g, c5.large, g4dn.2xlarge, c5.metal, i3en.6xlarge, inf1.2xlarge, d3.4xlarge, r6gd.4xlarge, m5.2xlarge, r6g.xlarge, c4, c5, m5dn.8xlarge, m6gd, r5n.16xlarge, m6g.8xlarge, m6gd.12xlarge, c5a.8xlarge, i2.xlarge, m5d.12xlarge, m5.metal, c5d.metal, m4.4xlarge, m5.12xlarge, inf1, m6g.12xlarge, r5n.4xlarge, m6gd.4xlarge, c4.large, c5d.2xlarge, z1d, d2, d3, r5d.2xlarge, x2gd.large, r5.xlarge, r5b.24xlarge, c4.4xlarge, c4.xlarge, c6g.large, c6gd.medium, r6gd.12xlarge, r4.8xlarge, m5d.xlarge, c6gd.2xlarge, m5.8xlarge, c5.2xlarge, g3.8xlarge, c5n.9xlarge, c5n.2xlarge, r4.2xlarge, c6gn.4xlarge, m5zn.6xlarge, m5zn.12xlarge, m5d.4xlarge, c6g.metal, c5a, c5d, c5d.xlarge, m5n.16xlarge, c6gn, r5ad.xlarge, r5a.8xlarge, c5a.16xlarge, c5n, c6gd, r3.4xlarge, c6g.12xlarge, r5b.xlarge, x1e.xlarge, c5.12xlarge, r5d.xlarge, m6g.large, m6gd.large, i3en.xlarge, c6gd.xlarge, r5n.2xlarge, p2.16xlarge, c6g, a1.metal, d3.xlarge, r6gd.2xlarge, r5dn.8xlarge, x1.16xlarge, r5n.12xlarge, m5a.4xlarge, c5n.metal, c5.xlarge, c5n.4xlarge, g2, m5d.24xlarge, g3, m5zn, c6gn.16xlarge, c5.9xlarge, r5d.8xlarge, d2.2xlarge, c6gd.16xlarge, r5.2xlarge, x1, i3en.2xlarge, r5ad.2xlarge, a1.large, r5b, r5a, r5d, m5n.2xlarge, m6gd.16xlarge, i2.8xlarge, z1d.12xlarge, m6g.metal, m5dn.4xlarge, r3.xlarge, r5n, x1e, m5dn.large, m5.24xlarge, g4dn.12xlarge, c6g.2xlarge, r5d.12xlarge, z1d.xlarge, i3en.24xlarge, m5ad.8xlarge, i3en.3xlarge, c5d.12xlarge, r5a.12xlarge, r5a.4xlarge, m5n.xlarge, c6gn.medium, i3.large, c6gd.large, c5a.12xlarge, r6g, r5ad.16xlarge, c5n.xlarge, i3.metal, c6gd.metal, i3.16xlarge, r6g.12xlarge, c5n.large, m4.16xlarge, i2, i3, x1e.16xlarge, r5.24xlarge, c6g.xlarge, r5.4xlarge, m6gd.8xlarge, m5dn.16xlarge, m6gd.metal, p2.8xlarge, g3.4xlarge, c6gn.8xlarge, r3.8xlarge, m5d.8xlarge, c5a.xlarge, x2gd.12xlarge, m5dn.metal, m5ad.12xlarge, r5ad.large, c5a.large, m4.xlarge, c6gd.4xlarge, g2.2xlarge, m5n.4xlarge, r5ad.12xlarge, m5dn.12xlarge, c4.2xlarge, g2.8xlarge, m5a.24xlarge, c6g.16xlarge, r5.large, m5n.large, z1d.large, x2gd, r3.2xlarge, m5d.2xlarge, m5zn.large, i3en, x1e.8xlarge, m6gd.medium, g4dn.4xlarge, r5d.4xlarge, c5d.24xlarge, r5d.metal, m6g.medium, x1.32xlarge, g4dn.xlarge, x2gd.xlarge, a1.2xlarge, r5b.8xlarge, m5ad.xlarge, r6g.medium, c4.8xlarge, m5a.8xlarge, c5d.9xlarge, m5ad.4xlarge, p2.xlarge, m5n.metal, g3s, r6g.large, r5ad.4xlarge, m5ad.24xlarge, r5ad, c5.24xlarge, r5.16xlarge, g4dn.metal, r4.xlarge, m5a.2xlarge, d3.8xlarge, m5ad.large, i3en.metal, r6g.2xlarge, p3.2xlarge, c6gn.large, m5d.16xlarge, m5a.xlarge, m5zn.xlarge, r5dn.12xlarge, m5dn.24xlarge, i3.2xlarge, r5ad.24xlarge, r6g.8xlarge, m4, r6gd.xlarge, m5, m5dn.xlarge, r5d.large, m5a.12xlarge, z1d.6xlarge, i2.4xlarge, m5zn.metal, x2gd.metal, r5dn.24xlarge, z1d.metal, d3.2xlarge, inf1.24xlarge, r6g.metal, i3.xlarge, x2gd.4xlarge, p3.16xlarge, d2.4xlarge, r5a.16xlarge, r5dn.4xlarge, m5.16xlarge, c6g.medium, i3en.large, m5d.large, r5a.xlarge, r5.8xlarge, m4.10xlarge, c5.4xlarge, r5dn.2xlarge, r5a.24xlarge, i3.8xlarge, c6g.8xlarge, m4.2xlarge, inf1.6xlarge, r5b.large, r5b.4xlarge, m5zn.2xlarge, r5n.metal, d2.xlarge, m5a.large, d2.8xlarge, c5n.18xlarge, m6g.4xlarge, r5n.xlarge, r6gd.large, r5b.12xlarge, m5n.8xlarge, g3.16xlarge, c5.18xlarge, p3.8xlarge, c6gn.xlarge, c6gd.8xlarge, m6g.16xlarge, r4.4xlarge, i3en.12xlarge, x2gd.16xlarge, g4dn.16xlarge, x1e.4xlarge, r5d.16xlarge, m4.large, r6gd.8xlarge, m5ad, g4dn.8xlarge, r5dn.large, r5n.24xlarge, i2.2xlarge, m5dn, m5n.12xlarge, c6gn.12xlarge, p2, r5.metal, p3, c5d.18xlarge, x1e.2xlarge, r5dn.xlarge, a1.xlarge, m5d.metal, c5a.4xlarge, r3.large, m5ad.2xlarge, x1e.32xlarge, z1d.2xlarge, r5ad.8xlarge, r6gd.medium, g3s.xlarge, x2gd.8xlarge, r6gd, m5a.16xlarge, c6gn.2xlarge, r5dn.metal, r5b.2xlarge, g4dn, r6gd.metal, r5.12xlarge, r4.large, c5a.24xlarge, m5ad.16xlarge, a1, r5b.metal, r5n.8xlarge, r6gd.16xlarge, a1.4xlarge, r5dn.16xlarge, m6gd.2xlarge, m5a, r5a.large, m5zn.3xlarge, r5dn, c5d.4xlarge, r5n.large, inf1.xlarge, m5d, m5.4xlarge], RequestId: ffb83731-2b6a-4a2c-92e4-d3b225c070bf