Backporting the dev branch to substrate 0.9.30 (#192)

Backporting the following PRs from the `dev` branch:
- [#184](#184)
- [#169](#169)
- [#175](#175)
- [#177](#177)
- [#159](#159)
- [#162](#162)
- [#153](#153)
- [#163](#163)
- [#143](#143)
- [#150](#150)
- [#149](#149)

---------

Co-authored-by: Raid5594 <52794079+Raid5594@users.noreply.github.com>
Co-authored-by: Alisher A. Khassanov <a.khssnv@gmail.com>

.maintain/frame-weight-template.hbs

@@ -47,22 +47,22 @@ impl<T: frame_system::Config> WeightInfo for SubstrateWeight<T> {
 		{{~#each benchmark.components as |c| ~}}
 		{{~#if (not c.is_used)}}_{{/if}}{{c.name}}: u32, {{/each~}}
 	) -> Weight {
-		Weight::from_ref_time({{underscore benchmark.base_weight}} as u64)
+		Weight::from_ref_time({{underscore benchmark.base_weight}}_u64)
 			{{#each benchmark.component_weight as |cw|}}
 			// Standard Error: {{underscore cw.error}}
-			.saturating_add(Weight::from_ref_time({{underscore cw.slope}} as u64).saturating_mul({{cw.name}} as u64))
+			.saturating_add(Weight::from_ref_time({{underscore cw.slope}}_u64).saturating_mul({{cw.name}} as u64))
 			{{/each}}
 			{{#if (ne benchmark.base_reads "0")}}
-			.saturating_add(T::DbWeight::get().reads({{benchmark.base_reads}} as u64))
+			.saturating_add(T::DbWeight::get().reads({{benchmark.base_reads}}_u64))
 			{{/if}}
 			{{#each benchmark.component_reads as |cr|}}
-			.saturating_add(T::DbWeight::get().reads(({{cr.slope}} as u64).saturating_mul({{cr.name}} as u64)))
+			.saturating_add(T::DbWeight::get().reads(({{cr.slope}}_u64).saturating_mul({{cr.name}} as u64)))
 			{{/each}}
 			{{#if (ne benchmark.base_writes "0")}}
-			.saturating_add(T::DbWeight::get().writes({{benchmark.base_writes}} as u64))
+			.saturating_add(T::DbWeight::get().writes({{benchmark.base_writes}}_u64))
 			{{/if}}
 			{{#each benchmark.component_writes as |cw|}}
-			.saturating_add(T::DbWeight::get().writes(({{cw.slope}} as u64).saturating_mul({{cw.name}} as u64)))
+			.saturating_add(T::DbWeight::get().writes(({{cw.slope}}_u64).saturating_mul({{cw.name}} as u64)))
 			{{/each}}
 	}
 	{{/each}}
@@ -82,22 +82,22 @@ impl WeightInfo for () {
 		{{~#each benchmark.components as |c| ~}}
 		{{~#if (not c.is_used)}}_{{/if}}{{c.name}}: u32, {{/each~}}
 	) -> Weight {
-		Weight::from_ref_time({{underscore benchmark.base_weight}} as u64)
+		Weight::from_ref_time({{underscore benchmark.base_weight}}_u64)
 			{{#each benchmark.component_weight as |cw|}}
 			// Standard Error: {{underscore cw.error}}
-			.saturating_add(Weight::from_ref_time({{underscore cw.slope}} as u64).saturating_mul({{cw.name}} as u64))
+			.saturating_add(Weight::from_ref_time({{underscore cw.slope}}_u64).saturating_mul({{cw.name}} as u64))
 			{{/each}}
 			{{#if (ne benchmark.base_reads "0")}}
-			.saturating_add(RocksDbWeight::get().reads({{benchmark.base_reads}} as u64))
+			.saturating_add(RocksDbWeight::get().reads({{benchmark.base_reads}}_u64))
 			{{/if}}
 			{{#each benchmark.component_reads as |cr|}}
-			.saturating_add(RocksDbWeight::get().reads(({{cr.slope}} as u64).saturating_mul({{cr.name}} as u64)))
+			.saturating_add(RocksDbWeight::get().reads(({{cr.slope}}_u64).saturating_mul({{cr.name}} as u64)))
 			{{/each}}
 			{{#if (ne benchmark.base_writes "0")}}
-			.saturating_add(RocksDbWeight::get().writes({{benchmark.base_writes}} as u64))
+			.saturating_add(RocksDbWeight::get().writes({{benchmark.base_writes}}_u64))
 			{{/if}}
 			{{#each benchmark.component_writes as |cw|}}
-			.saturating_add(RocksDbWeight::get().writes(({{cw.slope}} as u64).saturating_mul({{cw.name}} as u64)))
+			.saturating_add(RocksDbWeight::get().writes(({{cw.slope}}_u64).saturating_mul({{cw.name}} as u64)))
 			{{/each}}
 	}
 	{{/each}}