Add text-encoding-identifier-case rule

[fisker]

Fixes #1690

I think suggestion is good enough for this rule, we are checking all string literals, auto fix may break things.

[sindresorhus]

Suggested change

	# Enforce consistent case style for text encoding identifier
	# Enforce consistent case for text encoding identifiers

[alfaproject]

I've just had to ignore these false positives:

diff --git a/apps/lambda-data/src/utils/entity-schema-utils.ts b/apps/lambda-data/src/utils/entity-schema-utils.ts
index ed782e335..fc7e4d10d 100644
--- a/apps/lambda-data/src/utils/entity-schema-utils.ts
+++ b/apps/lambda-data/src/utils/entity-schema-utils.ts
@@ -199,7 +199,7 @@ export class EntitySchemaUtils {
             },
             string: {
               compression: 'GZIP',
-              type: 'UTF8',
+              type: 'UTF8', // eslint-disable-line unicorn/text-encoding-identifier-case
             },
           };

@@ -249,7 +249,7 @@ export class EntitySchemaUtils {
                   typeConversion[fieldName] = PARQUET_CONVERSIONS.toNumber;
                 }
                 break;
-              case 'UTF8':
+              case 'UTF8': // eslint-disable-line unicorn/text-encoding-identifier-case
                 typeConversion[fieldName] = PARQUET_CONVERSIONS.toJson;
                 break;
               case 'DECIMAL':

Not a big deal but not sure if it's expected